Symptoms

After succussfully setting up the Hot Folder Profile and Signing In through properties we can see a message "Thank you for allowing access'". 

It is not possible to click Browse, either in the General tab or the Cleanup Folder tab. The error message comes up

Code: generalException Message: An error occurred sending the request.

Cause

Please try to to open https://graph.microsoft.com/v1.0/me/ in browser, it should result in "Access token is empty." error in json format.

It if fails in browser too, it means that this issue is related to azure root certificate changes as per this article:  https://docs.microsoft.com/en-us/azure/security/fundamentals/tls-certificate-changes.

Resolution

Installation of latest Windows updates to bring your system up to date.
You also need to manually install DigiCert Global Root G2 certificate.