Can't get iServices to work whatever I do

I've followed the guide many times but every time I sign in into iMessage, it logs me in, and after 5-10 seconds, it crashes and logs me back out.

I've tried / make sure that:

1. My serial information is correct (tried both an invalid and a "Purchase Date not Validated" one)
2. Made sure I have en0
3. Fixed ROM (with my real MAC address)
4. Verified my NVRAM works (it works)
5. Reset my NVRAM
6. I've cleared out any previous attempts
7. I have 2FA enabled, I have a real MacBook Pro linked to my Apple ID and I have a payment card connected.

After I've done all of this, I logged in with my Apple ID through settings, and then I signed in with my Apple ID in iMessage. When signing in in iMessage, it doesn't ask me for a 2FA code. It just signs me in and after 5-10 seconds, it closes and logs me back out.

I've never received the Customer Code error.

Info: iMac15,1

Big Sur 11.4, OpenCore 0.7.1 (stable), i5 4460, gigabyte b85m hd3, 8GB RAM