"Required parameters missing in 'options.publicKey'" when using excludeCredentials

[badlucksoft]

I've only been working on getting the Webauthn library working within my project for a week or so, and I can successfully register a single credential without any problems. The problems occur when I attempt to use the excludeCredentials parameter in PublicKeyCredentialCreationOptions::create() to make sure the same authenticator isn't registered again.

Currently, I'm getting a vague error from Chrome stating that "Required parameters missing in options.publicKey."

I'm building an array containing PublicKeyCredentialDescriptors created from reconstituted PublicKeyCredentialSources stored in my database from a json_array containing any and all registered credentials for the user. This is an excerpt from the function that builds the descriptors:

foreach ($creds->credentialEntries as $index => $entry) {

	if ($entry->data !== false) {
		$entryData = json_decode($entry->data, true);
		$entryData['publicKeyCredentialId'] = base64_decode($entryData['publicKeyCredentialId']);
		$entryData['credentialPublicKey'] = base64_decode($entryData['credentialPublicKey']);
		$cred = PublicKeyCredentialSource::create(
			$entryData['publicKeyCredentialId'],
			$entryData['type'],
			$entryData['transports'],
			$entryData['attestationType'],
			CertificateTrustPath::create($entryData['trustPath']),
			Uuid::FromString($entryData['aaguid']),
			$entryData['credentialPublicKey'],
			$entryData['userHandle'],
			$entryData['counter'],
			$entryData['otherUI'],
			$entryData['backupEligible'],
			$entryData['backupStatus'],
			$entryData['uvInitialized']
		);
		
		try {
			$descriptors[] = $cred->getPublicKeyCredentialDescriptor();
		} catch (Exception $e) {
			throw $e;
		}
	}
}
return $descriptors;

Those descriptors are then received in a variable called $excludeCredentials which I check against empty/failed values and build my publicKeyCredentialCreationOptions

            if (!empty($excludeCreds)) {
                $this->publicKeyCredentialCreationOptions = PublicKeyCredentialCreationOptions::create(
                    $rpEntity,
                    $userEntity,
                    bin2hex($challenge),
                    array(
                        PublicKeyCredentialParameters::create('public-key', Algorithms::COSE_ALGORITHM_ES256),
                        PublicKeyCredentialParameters::create('public-key', Algorithms::COSE_ALGORITHM_RS256)
                    ),
                    excludeCredentials: $excludeCreds
                );

The JSON sent to the client via AJAX looks something like this, where it is nested in another JSON object:

{"status":"success","options":"{\"challenge\":\"<encoded string>\",\"rp\":{\"id\":\"example.com\",\"icon\":null,\"name\":\"My Example Site\"},\"user\":{\"id\":\"<encoded string>\",\"name\":\"username\",\"displayName\":\"Display Name\"},\"pubKeyCredParams\":[{\"type\":\"publicKey\",\"alg\":-7},{\"type\":\"publicKey\",\"alg\":-257}],\"excludeCredentials\":[{\"type\":\"public-key\",\"id\":\"<encoded string>\"}]}"}

The only difference between the working version and this failing version, is the inclusion of excludeCredentials: $excludeCreds. In the javascript side of things, which I suppose are out of scope for the library, I convert the publicKeyCredentialCreationOptions.challenge, publicKeyCredentialCreationOptions.user.id, and publicKeyCredentialCreationOptions.excludeCredentials[*].id values into Uint8Array() from either base64, base64 url, or hex encoded strings as appropriate, but when running this, I get the Required parameters missing in `options.publicKey'. message:

               const credential = await navigator.credentials.create({
                    publicKey: publicKeyCredentialCreationOptions
                });

I've spent quite a few hours trying to resolve this on my own, searching the web for a solution or hint, and even asking a few good AI chatbots for input on what might be happening, but haven't been able to resolve it. So, I thought I'd ask here. I'm sure there's a lot more information that's needed, please let me know what you need and I'll provide it if I can to get this resolved.

Thank you!