In 2019, Microsoft commenced applying the Security Defaults to new Microsoft 365 accounts. These security defaults are not required to be modified in order to use FYI with Microsoft 365. If the Security Defaults are applied to an existing Microsoft 365 account, FYI will continue to work as expected.
However, if these Security Defaults are applied to existing Microsoft 365 accounts, FYI's Authentication Tokens may be revoked until users log out and into FYI.
This may particularly affect the OneDrive Admin. We strongly recommend the OneDrive Admin logs out and back into FYI after the Security Defaults are applied to allow both Co-Edit and Collaborate to continue functioning.