Microsoft is actively deprecating the RPS protocol in Exchange Online PowerShell. If you encounter issues with viewing the properties of Exchange Online mailboxes in Adaxes, it could be because Microsoft has disabled RPS in your tenant.
The most typical error messages are:
Older Adaxes versions relied on RPS to perform operations in Exchange Online. To continue using the Exchange Online features in Adaxes, you need to update to a newer version that relies on the Exchange Online Management V3 PowerShell module instead of RPS. Adaxes uses the EXOV3 module starting from the following versions: