Contacting your domain admin, using your backup codes, if none of those work you'll need to fill an account recovery form with the service provider, ie: https:/

Contacting your domain admin, using your backup codes, if none of those work you'll need to fill an account recovery form with the service provider, ie: https://support.google.com/accounts/answer/185834?hl=en#phone https://support.google.com/accounts/answer/185834?hl=en#phon...