Is this the first major iPhone release since passkeys have started becoming more widely adopted?
If you are moving from Android to iPhone this week you may want to check all the consumer services you registered a passkey in Google Password manager before you wipe or trade in your phone. You will need to re register a passkey on your iPhone using Apple Passwords.
Can you see them in the web browser for your Google account at least if you already traded it in and don’t have another android device?
Syncable passkeys are not currently transferable across passkey ecosystems so you have to register passkeys again if switching ecosystems.
If you are using device bound passkeys via Microsoft Entra you will need to re register on your new device.