Office 365 Actions Fail With Error: 'The Username Is Invalid Or Does Not Exist'
When a Nintex for Office 365 workflow configured with one of the Office 365 workflow actions runs, the workflow suspends with the error: 'The username is invalid or does not exist, or the password is invalid for the username specified' in the workflow history.
Verify that the username and password within the Office 365 action is correct (eg. firstname.lastname@example.org vs. email@example.com)
Verify that the account being used does not have Multi-Factor Authentication (MFA) enabled, as MFA is not currently supported by Nintex for Office 365
Verify that the action works with an @domain.onmicrosoft.com account vs. an @domain.com account. Success with an @domain.onmicrosft.com account vs a domain account will indicate an issue with ADFS. The Microsoft Remote Connectivity Analyzer can be used to investigate ADFS issues further.