IT Support Services

Resolving Microsoft 365 Log-in Issues

Microsoft authentication prompt example

Microsoft authentication example

[September 3, 2021] If you are trying to log-in to your Sheridan Microsoft 365 account via, you will intially be prompted to log-in via Microsoft’s authentication services rather than Sheridan’s Single Sign-On (SSO) service. This can also sometimes happen if you're trying to access a link to a shared document (e.g. a Word or Excel file).

For MS authentication, you will prompted first for your UPN (user principal name) before being directed to Sheridan SSO to complete the log-in process. Your UPN is in the format ''. You can find your UPN by logging into the User Info Utility.

User’s accessing apps and services through Sheridan’s Office portal – – will still sign-on using Sheridan SSO.

Questions or Concerns?

If you have questions or concerns about any of these changes, contact the IT Service Desk at or call 905-845-9430 ext. 2150.