In the production app, passkeys are restricted to specific user IDs for testing purposes. Only users with the following IDs can use passkeys:
25cab510-41e4-4bb9-9999-fc07fff63711
f2c11361-a3a9-4527-90be-d60eb90e7980
ba615caa-70dd-4fa1-bf85-6862f757d11d
4bc40cdf-2e4b-454a-bfeb-9f03c83e1658
This debug page bypasses these restrictions for local testing purposes.