Veeam Backup for Microsoft Azure

Question

In Veeam Backup for Microsoft Azure I have to go through the initial setup steps. When I add a Microsoft Azure account to connect to Microsoft Azure subscriptions to add storage accounts I have the following issue:

this issue, but the port is open

or

this issue

this is the guide

https://learn.microsoft.com/en-us/power-apps/developer/data-platform/walkthrough-register-app-azure-active-directory

thank for the support.

Regards

Nicola