An Azure service that is used to provision Windows and Linux virtual machines.
The issue could be expired internal certificate.
Below are few suggestions you can check to solve the issue:
This has to be renewed, and if you are using a RDWebClient new cert has to be imported into the RDWebClient also.
In PowerShell elevated mode, load RDWebClientManagement-module and try running these commands to change the Certificate in RDWebClient.
“Import-Module -Name RDWebClientManagement”
“Get-RDWebClientBrokerCert”
“Import-RDWebClientBrokerCert <Path of Certtificate file> .crt or .cer”
“Get-RDWebClientBrokerCert“
Reset the Remote Desktop Services configuration, refer this document for steps.
Another similar issue: https://learn.microsoft.com/en-us/answers/questions/85776/receiving-34couldn39t-connect34-for-all-previously.html
Hope this helps.
If the suggested response helped you resolve your issue, please 'Accept as answer', so that it can help others in the community looking for help on similar topics.