diff --git a/packages/destination-actions/src/destinations/attio/assertRecord/__tests__/index.test.ts b/packages/destination-actions/src/destinations/attio/assertRecord/__tests__/index.test.ts
index 6338b6ae9b..3356afaea8 100644
--- a/packages/destination-actions/src/destinations/attio/assertRecord/__tests__/index.test.ts
+++ b/packages/destination-actions/src/destinations/attio/assertRecord/__tests__/index.test.ts
@@ -141,4 +141,30 @@ describe('Attio.assertRecord', () => {
 
     expect(response.status).toBe(202)
   })
+
+  it('handles the case where receivedAt is not provided', async () => {
+    const lackingReceivedAtEvent = createTestEvent({
+      type: 'track' as const,
+      traits: {
+        name: 'Stair car',
+        number_of_wheels: 4
+      },
+      receivedAt: undefined
+    })
+
+    // Can't control the exact timestamp, so only check it starts on the same year-month-day and is ISO8601 formatted
+    const datePrefix = new Date().toISOString().split('T')[0]
+
+    nock('https://api.attio.com')
+      .put('/v2/batch/records', new RegExp(`"received_at":"${datePrefix}T`))
+      .reply(202, '')
+
+    const [response] = await testDestination.testBatchAction('assertRecord', {
+      events: [lackingReceivedAtEvent],
+      mapping,
+      settings: {}
+    })
+
+    expect(response.status).toBe(202)
+  })
 })
diff --git a/packages/destination-actions/src/destinations/attio/assertRecord/generated-types.ts b/packages/destination-actions/src/destinations/attio/assertRecord/generated-types.ts
index 2725423d10..56e2b78b8c 100644
--- a/packages/destination-actions/src/destinations/attio/assertRecord/generated-types.ts
+++ b/packages/destination-actions/src/destinations/attio/assertRecord/generated-types.ts
@@ -26,5 +26,5 @@ export interface Payload {
   /**
    * When the event was received.
    */
-  received_at: string | number
+  received_at?: string | number
 }
diff --git a/packages/destination-actions/src/destinations/attio/assertRecord/index.ts b/packages/destination-actions/src/destinations/attio/assertRecord/index.ts
index f8f69a908b..b784e77ba1 100644
--- a/packages/destination-actions/src/destinations/attio/assertRecord/index.ts
+++ b/packages/destination-actions/src/destinations/attio/assertRecord/index.ts
@@ -97,7 +97,7 @@ const action: ActionDefinition<Settings, Payload> = {
         matching_attribute: item.matching_attribute,
         multiselect_values: 'append',
         values: (item.attributes as Record<string, SimpleValue>) ?? {},
-        received_at: item.received_at.toString()
+        received_at: item.received_at?.toString() ?? new Date().toISOString()
       }))
     })
   }
diff --git a/packages/destination-actions/src/destinations/attio/common-fields.ts b/packages/destination-actions/src/destinations/attio/common-fields.ts
index bdbff47547..73674cb64f 100644
--- a/packages/destination-actions/src/destinations/attio/common-fields.ts
+++ b/packages/destination-actions/src/destinations/attio/common-fields.ts
@@ -24,7 +24,7 @@ export const commonFields: ActionDefinition<Settings>['fields'] = {
     label: 'Received at',
     description: 'When the event was received.',
     type: 'datetime',
-    required: true,
+    required: false,
     default: {
       '@path': '$.receivedAt'
     }
diff --git a/packages/destination-actions/src/destinations/attio/groupWorkspace/__tests__/index.test.ts b/packages/destination-actions/src/destinations/attio/groupWorkspace/__tests__/index.test.ts
index a3cdd4e451..c285576a35 100644
--- a/packages/destination-actions/src/destinations/attio/groupWorkspace/__tests__/index.test.ts
+++ b/packages/destination-actions/src/destinations/attio/groupWorkspace/__tests__/index.test.ts
@@ -224,4 +224,28 @@ describe('Attio.groupWorkspace', () => {
     expect(responses.length).toBe(2)
     expect(responses[1].status).toBe(202)
   })
+
+  it('handles the case where receivedAt is not provided', async () => {
+    const lackingReceivedAtEvent = createTestEvent({
+      type: 'group' as const,
+      traits: {
+        id: '42',
+        domain
+      },
+      receivedAt: undefined
+    })
+
+    // Can't control the exact timestamp, so only check it starts on the same year-month-day and is ISO8601 formatted
+    const datePrefix = new Date().toISOString().split('T')[0]
+
+    nock('https://api.attio.com')
+      .put('/v2/batch/records', new RegExp(`"received_at":"${datePrefix}T`))
+      .reply(202, '')
+
+    await testDestination.testBatchAction('groupWorkspace', {
+      events: [lackingReceivedAtEvent],
+      mapping,
+      settings: {}
+    })
+  })
 })
diff --git a/packages/destination-actions/src/destinations/attio/groupWorkspace/generated-types.ts b/packages/destination-actions/src/destinations/attio/groupWorkspace/generated-types.ts
index 60ab260dd2..e5014806b0 100644
--- a/packages/destination-actions/src/destinations/attio/groupWorkspace/generated-types.ts
+++ b/packages/destination-actions/src/destinations/attio/groupWorkspace/generated-types.ts
@@ -36,5 +36,5 @@ export interface Payload {
   /**
    * When the event was received.
    */
-  received_at: string | number
+  received_at?: string | number
 }
diff --git a/packages/destination-actions/src/destinations/attio/groupWorkspace/index.ts b/packages/destination-actions/src/destinations/attio/groupWorkspace/index.ts
index 79c9c26e27..f02f0d19cf 100644
--- a/packages/destination-actions/src/destinations/attio/groupWorkspace/index.ts
+++ b/packages/destination-actions/src/destinations/attio/groupWorkspace/index.ts
@@ -128,10 +128,10 @@ const action: ActionDefinition<Settings, Payload> = {
               domains: item.domain,
               ...(item.company_attributes ?? {})
             },
-            received_at: item.received_at.toString()
+            received_at: item.received_at?.toString() ?? new Date().toISOString()
           }
         },
-        received_at: item.received_at.toString()
+        received_at: item.received_at?.toString() ?? new Date().toISOString()
       }))
     })
   }
diff --git a/packages/destination-actions/src/destinations/attio/identifyUser/__tests__/index.test.ts b/packages/destination-actions/src/destinations/attio/identifyUser/__tests__/index.test.ts
index 6aac56c4b8..0376a41b97 100644
--- a/packages/destination-actions/src/destinations/attio/identifyUser/__tests__/index.test.ts
+++ b/packages/destination-actions/src/destinations/attio/identifyUser/__tests__/index.test.ts
@@ -125,4 +125,29 @@ describe('Attio.identifyUser', () => {
     expect(responses.length).toBe(2)
     expect(responses[1].status).toBe(202)
   })
+
+  it('handles the case where receivedAt is not provided', async () => {
+    const lackingReceivedAtEvent = createTestEvent({
+      type: 'identify' as const,
+      userId: '9',
+      traits: {
+        name: 'George Oscar Bluth',
+        email
+      },
+      receivedAt: undefined
+    })
+
+    // Can't control the exact timestamp, so only check it starts on the same year-month-day and is ISO8601 formatted
+    const datePrefix = new Date().toISOString().split('T')[0]
+
+    nock('https://api.attio.com')
+      .put('/v2/batch/records', new RegExp(`"received_at":"${datePrefix}T`))
+      .reply(202, '')
+
+    await testDestination.testBatchAction('identifyUser', {
+      events: [lackingReceivedAtEvent],
+      mapping,
+      settings: {}
+    })
+  })
 })
diff --git a/packages/destination-actions/src/destinations/attio/identifyUser/generated-types.ts b/packages/destination-actions/src/destinations/attio/identifyUser/generated-types.ts
index 4d380f30af..54f895f86b 100644
--- a/packages/destination-actions/src/destinations/attio/identifyUser/generated-types.ts
+++ b/packages/destination-actions/src/destinations/attio/identifyUser/generated-types.ts
@@ -32,5 +32,5 @@ export interface Payload {
   /**
    * When the event was received.
    */
-  received_at: string | number
+  received_at?: string | number
 }
diff --git a/packages/destination-actions/src/destinations/attio/identifyUser/index.ts b/packages/destination-actions/src/destinations/attio/identifyUser/index.ts
index 749a66d333..683c8917b2 100644
--- a/packages/destination-actions/src/destinations/attio/identifyUser/index.ts
+++ b/packages/destination-actions/src/destinations/attio/identifyUser/index.ts
@@ -112,10 +112,10 @@ const action: ActionDefinition<Settings, Payload> = {
               email_addresses: item.email_address,
               ...(item.person_attributes ?? {})
             },
-            received_at: item.received_at.toString()
+            received_at: item.received_at?.toString() ?? new Date().toISOString()
           }
         },
-        received_at: item.received_at.toString()
+        received_at: item.received_at?.toString() ?? new Date().toISOString()
       }))
     })
   }