diff --git a/administration/src/bp-modules/cards/AddCardForm.tsx b/administration/src/bp-modules/cards/AddCardForm.tsx
index 6fadd5ba8..cc3fbc4b0 100644
--- a/administration/src/bp-modules/cards/AddCardForm.tsx
+++ b/administration/src/bp-modules/cards/AddCardForm.tsx
@@ -1,6 +1,6 @@
 import { Button, Card, FormGroup, InputGroup, Intent } from '@blueprintjs/core'
 import { TextField } from '@mui/material'
-import React, { ChangeEvent, ReactElement } from 'react'
+import React, { ChangeEvent, JSXElementConstructor, ReactElement } from 'react'
 import styled from 'styled-components'
 
 import { CardBlueprint } from '../../cards/CardBlueprint'
@@ -29,13 +29,17 @@ type CreateCardsFormProps = {
 }
 
 export const maxCardValidity = { years: 99 }
-export const ExtensionForm = ({ extension, onUpdate, viewportSmall }: ExtensionFormProps) => {
+export const ExtensionForm = ({
+  extension,
+  onUpdate,
+  viewportSmall,
+}: ExtensionFormProps): ReactElement<ExtensionInstance, string | JSXElementConstructor<ExtensionInstance>> | null => {
   return extension.createForm(() => {
     onUpdate()
   }, viewportSmall)
 }
 
-const CreateCardForm = ({ cardBlueprint, onRemove, onUpdate }: CreateCardsFormProps): ReactElement => {
+const AddCardForm = ({ cardBlueprint, onRemove, onUpdate }: CreateCardsFormProps): ReactElement => {
   const { viewportSmall } = useWindowDimensions()
   const today = PlainDate.fromLocalDate(new Date())
   return (
@@ -89,4 +93,4 @@ const CreateCardForm = ({ cardBlueprint, onRemove, onUpdate }: CreateCardsFormPr
   )
 }
 
-export default CreateCardForm
+export default AddCardForm
diff --git a/administration/src/bp-modules/cards/AddCardsForm.tsx b/administration/src/bp-modules/cards/AddCardsForm.tsx
index dfcbe10a2..c2a9b7abf 100644
--- a/administration/src/bp-modules/cards/AddCardsForm.tsx
+++ b/administration/src/bp-modules/cards/AddCardsForm.tsx
@@ -6,7 +6,7 @@ import styled from 'styled-components'
 import { CardBlueprint } from '../../cards/CardBlueprint'
 import { Region } from '../../generated/graphql'
 import { ProjectConfigContext } from '../../project-configs/ProjectConfigContext'
-import CreateCardForm from './AddCardForm'
+import AddCardForm from './AddCardForm'
 import CardFormButton from './CardFormButton'
 import { getHeaders } from './ImportCardsController'
 
@@ -110,7 +110,7 @@ const AddCardsForm = ({
         }}>
         {cardBlueprints.map(blueprint => (
           <FormColumn key={blueprint.id}>
-            <CreateCardForm
+            <AddCardForm
               cardBlueprint={blueprint}
               onRemove={() => removeCardBlueprint(blueprint)}
               onUpdate={notifyUpdate}
diff --git a/administration/src/bp-modules/self-service/CardSelfServiceForm.tsx b/administration/src/bp-modules/self-service/CardSelfServiceForm.tsx
index f0d1a0d48..40e8feac9 100644
--- a/administration/src/bp-modules/self-service/CardSelfServiceForm.tsx
+++ b/administration/src/bp-modules/self-service/CardSelfServiceForm.tsx
@@ -29,6 +29,7 @@ const StyledCheckbox = styled(Checkbox)`
 
 const StyledAlert = styled(Alert)`
   margin-bottom: 24px;
+  white-space: pre-line;
 `
 
 const Container = styled('div')`
@@ -52,7 +53,7 @@ const getTooltipMessage = (cardsValid: boolean, dataPrivacyAccepted: boolean): s
     tooltipMessages.push('Bitte akzeptieren Sie die Datenschutzerklärung.')
   }
 
-  return tooltipMessages.join(' ')
+  return tooltipMessages.join('\n')
 }
 const CardSelfServiceForm = ({
   card,
@@ -123,11 +124,7 @@ const CardSelfServiceForm = ({
         maxWidth='md'
         onUpdateOpen={setOpenDataPrivacy}
         title={projectConfig.dataPrivacyHeadline}
-        content={
-          <>
-            <projectConfig.dataPrivacyContent />
-          </>
-        }
+        content={<projectConfig.dataPrivacyContent />}
       />
     </>
   )
diff --git a/administration/src/bp-modules/self-service/hooks/useCardGeneratorSelfService.ts b/administration/src/bp-modules/self-service/hooks/useCardGeneratorSelfService.ts
index 22946a69d..8dc23be44 100644
--- a/administration/src/bp-modules/self-service/hooks/useCardGeneratorSelfService.ts
+++ b/administration/src/bp-modules/self-service/hooks/useCardGeneratorSelfService.ts
@@ -79,7 +79,7 @@ const useCardGeneratorSelfService = (): UseCardGeneratorSelfServiceReturn => {
     [appToaster, setSelfServiceState]
   )
 
-  const generateCards = useCallback(async () => {
+  const generateCards = useCallback(async (): Promise<void> => {
     setIsLoading(true)
 
     try {
@@ -125,9 +125,9 @@ const useCardGeneratorSelfService = (): UseCardGeneratorSelfServiceReturn => {
     } catch (error) {
       handleErrors(error)
     }
-  }, [selfServiceCards, projectConfig, setIsLoading, setSelfServiceCards, setDeepLink, setCode])
+  }, [projectConfig, setIsLoading, setDeepLink, setCode, createCardsSelfService, handleErrors, selfServiceCards])
 
-  const downloadPdf = async (code: CreateCardsResult, fileName: string) => {
+  const downloadPdf = async (code: CreateCardsResult, fileName: string): Promise<void> => {
     const blob = await generatePdf([code], selfServiceCards, projectConfig.pdf)
     downloadDataUri(blob, fileName)
   }
diff --git a/administration/src/cards/PdfFactory.ts b/administration/src/cards/PdfFactory.ts
index dc89d1fbb..5a8efdd35 100644
--- a/administration/src/cards/PdfFactory.ts
+++ b/administration/src/cards/PdfFactory.ts
@@ -82,7 +82,7 @@ export async function generatePdf(
   cardBlueprints: CardBlueprint[],
   pdfConfig: PdfConfig,
   region?: Region
-):Promise<Blob> {
+): Promise<Blob> {
   try {
     const doc = await PDFDocument.create()
 
diff --git a/administration/src/cards/extensions/BirthdayExtension.tsx b/administration/src/cards/extensions/BirthdayExtension.tsx
index 7decc7341..9962b4d32 100644
--- a/administration/src/cards/extensions/BirthdayExtension.tsx
+++ b/administration/src/cards/extensions/BirthdayExtension.tsx
@@ -1,7 +1,7 @@
 import { Colors, FormGroup } from '@blueprintjs/core'
 import { PartialMessage } from '@bufbuild/protobuf'
 import { TextField } from '@mui/material'
-import {ReactElement} from "react";
+import { ReactElement } from 'react'
 
 import { CardExtensions } from '../../generated/card_pb'
 import PlainDate from '../../util/PlainDate'
@@ -14,7 +14,7 @@ const minBirthday = new PlainDate(1900, 1, 1)
 class BirthdayExtension extends Extension<BirthdayState, null> {
   public readonly name = BirthdayExtension.name
 
-  setInitialState() {
+  setInitialState(): void {
     this.state = { birthday: minBirthday.toDaysSinceEpoch() }
   }
 
diff --git a/administration/src/cards/extensions/KoblenzReferenceNumberExtension.tsx b/administration/src/cards/extensions/KoblenzReferenceNumberExtension.tsx
index 2fede4464..ce678b60b 100644
--- a/administration/src/cards/extensions/KoblenzReferenceNumberExtension.tsx
+++ b/administration/src/cards/extensions/KoblenzReferenceNumberExtension.tsx
@@ -1,5 +1,6 @@
 import { FormGroup, InputGroup, Intent } from '@blueprintjs/core'
 import { PartialMessage } from '@bufbuild/protobuf'
+import { ReactElement } from 'react'
 
 import { CardExtensions } from '../../generated/card_pb'
 import ClearInputButton from './components/ClearInputButton'
@@ -13,8 +14,8 @@ const KoblenzReferenceNumberMaxLength = 15
 class KoblenzReferenceNumberExtension extends Extension<KoblenzReferenceNumberState, null> {
   public readonly name = KoblenzReferenceNumberExtension.name
 
-  setInitialState() {}
-  createForm(onUpdate: () => void, viewportSmall = true) {
+  setInitialState(): void {}
+  createForm(onUpdate: () => void, viewportSmall = true): ReactElement {
     const clearInput = () => {
       this.state = { referenceNumber: '' }
       onUpdate()
@@ -53,16 +54,16 @@ class KoblenzReferenceNumberExtension extends Extension<KoblenzReferenceNumberSt
     )
   }
 
-  causesInfiniteLifetime() {
+  causesInfiniteLifetime(): boolean {
     return false
   }
-  setProtobufData(message: PartialMessage<CardExtensions>) {
+  setProtobufData(message: PartialMessage<CardExtensions>): void {
     message.extensionKoblenzReferenceNumber = {
       referenceNumber: this.state?.referenceNumber,
     }
   }
 
-  isValid() {
+  isValid(): boolean {
     return (
       this.state !== null &&
       this.state.referenceNumber.length >= KoblenzReferenceNumberMinLength &&
@@ -70,14 +71,11 @@ class KoblenzReferenceNumberExtension extends Extension<KoblenzReferenceNumberSt
     )
   }
 
-  fromString(state: string) {
-    if (state === null) {
-      this.state = null
-    }
+  fromString(state: string): void {
     this.state = { referenceNumber: state }
   }
 
-  toString() {
+  toString(): string {
     return this.state?.referenceNumber ?? ''
   }
 }
diff --git a/administration/src/project-configs/koblenz/activationText.tsx b/administration/src/project-configs/koblenz/activationText.tsx
index 6df7171a4..9acd83a74 100644
--- a/administration/src/project-configs/koblenz/activationText.tsx
+++ b/administration/src/project-configs/koblenz/activationText.tsx
@@ -1,5 +1,5 @@
 import { Button, Typography, styled } from '@mui/material'
-import React from 'react'
+import React, { ReactElement } from 'react'
 
 const ActivationButton = styled(Button)`
   margin-top: 12px;
@@ -8,7 +8,7 @@ const ActivationButton = styled(Button)`
   }
 `
 
-export const ActivationText = (applicationName: string, downloadLink: string, deepLink: string) => (
+export const ActivationText = (applicationName: string, downloadLink: string, deepLink: string): ReactElement => (
   <div>
     <Typography variant='h6' mb='8px'>
       Aktivierung nur in der App möglich