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OAuth 2.0 authentication is carried out using special access tokens. These tokens are stored in the project file and need to be updated regularly. By default, the refresh token required to use the Microsoft Graph Mail API will expire after 90 days of inactivity and you will need to re-authenticate to obtain a new token. Token lifetime can be configured by an Active Directory administrator (see Microsoft documentation for details). These tokens are stored in the dbo.Identities table in the SQL database. They need to be updated regularly, which is done automatically by the Token Management Service (alternatively - TMS).
TMS is installed using the main install wizard and is set up parallel to FlexiCapture using the Administration and Monitoring Console. Once a connection to a database has been set up, either the entire IIS or your particular TMS pool will need to be restarted.