Thank you for sharing error details with me.
Could you let me know what you'll be doing after you receive the call?
Phone call verification is a method of verifying a user's identity during the authentication process in Entra Verified ID. The user must answer the phone call and enter their PIN (if applicable) and press # to move on to the next step of the authentication process.
Ensure that you are entering the correct PIN (if applicable) when prompted during the phone call verification process.
For your reference : Phone call verification
Hope this helps. Do let us know if you any further queries.
Thanks,
Navya.