Overview
When using M-Files Teams add-on and Azure Conditional Access, opening M-Files add-on through Microsoft Teams desktop client requires 2FA (Two Factor Authentication)/MFA (Multi-Factor Authentication) sign-in even when on trusted workstation (should not promt MFA). When using regular M-Files Desktop the issue does not appear.
You can read more about this issue "Tabs not working after enabling Conditional Access" from Microsoft page: https://docs.microsoft.com/en-us/microsoftteams/troubleshoot/known-issues/tabs-dont-work-after-enabling-conditional-access
Solution
1. In Azure AD, select "Security" and select "Conditional Access" and then choose "New policy"
2. Add only application "M-Files SSO" into it
3. Set other setting like your general policy
4. Change Sign-in frequency to XX days, which could be same as your password age policy
