Check if your archive URL is registered in the Mailstore under the directory service in the “Redirect URI”. The addition of “/oidc/signin” at the end of the URL is crucial. The same URL must also be registered in Azure Active Directory under the Mail Archive profile in the app registration under “Front Channel Sign-in”, and also in the Redirect URI with the same addition. The ID token must also be set there. For further information, please refer to the detailed instructions at: https://sms-info.synaxon.de/managed-e-mail-archivierung/info/
