I've changed the email from our domain email to the. I even went so far as removing him from Office 365 with PowerShell, deleting him from the deleted users folder (with PowerShell) and then re-syncing him again and the issue still occurs. I can also confirm that Multi-Factor Authentication is not enabled for any of our users either. I've checked the obvious things as well, he is definitely licensed to use Skype for Business. However, he can log into other Office applications and the 365 portal just fine with the same details. And the issue occurs if he logs onto another computer and even a freshly built computer. I found a few things online about resetting the Skype's cache and removing the SIP folders for the account etc. The error message states his username/password/domain are incorrect. Most likely an AD password change caused Skype to log out and required him to log back in again with his new credentials.
I have a user who used to be able to log into Skype for Business 2016 without any issues and then one day he couldn't. We've been using it now for around 2/3 years without any issues at all, except this one. We have Office 365 E3 Enterprise which syncs with our local Active Directory using Azure AD sync.
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