As of 12/31/2022, Microsoft has stopped supporting simple authentication for access to Exchange Online.
This authentication mode is used until version 1.9 of this connector.
As of version 1.10, two connectors coexist: the classic connector, compatible with on-premise Exchange installations, and the "Microsoft Graph" connector, using OAUth 2.0 authentication, compatible with Exchange Online.
Follow the documentation to configure the Microsoft Graph connector
To be able to use the Exchange connector features, you must grant the following rights in Azure :
In the case of connection by Application Authorization, these rights must be granted directly to the application.
In the case of authentication by Entra ID, users must be authorized to consent to these rights.