If you've already changed the 2-step verification method, it's probably not 2SV you're being prompted for, but a sign-in challenge.
Be sure to:
- remove any recovery phone numbers and email addresses of the former user
- delete the account from any devices they're signed into'
- reset sign-in cookies
- generate and use backup codes to sign in via 2SV as necessary
- bypass login challenges if you're still having problems signing in
You shouldn't need to... but if you really want to turn off 2SV (although I don't recommend it for obvious security reasons), you can create an allow group or move the user into an OU where 2SV is turned off.
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