In most cases, both your sign-in address and user name look like one of these examples: The first step is to try to sign in with your credentials in another location: Microsoft 365 Web Scheduler.
The amount of time you spend will depend on the type of installation you have, and the causes of your sign-in issues.
Please complete each troubleshooting step, even if it doesn't seem to apply to you. Some troubleshooting steps are different depending on the type of installation you have.
