When configuring Microsoft® as your mail provider or for email importing, a Connection unsuccessful error message displays after you click Connect:

Connection unsuccessful. Please close this window and try again.

The Application (client) ID and Client Secret combination for your Microsoft Azure® app are invalid.

Create a new app via the Microsoft Azure Portal. Make certain to copy the Application (client) ID and Client Secret Value correctly.

The Application (client) ID is displayed on the App's home screen:

The Client Secret Value is displayed on the App's Certificates & secrets screen after creating the secret:

For step-by-step instructions, see:

• Setting Up Microsoft As Your Mail Service Provider
• Setting Up Importing via Microsoft