Remote Desktop Licensing Diagnoser checks the wrong Licensing Server

We have started using Server 2016 as RDS session hosts and we had to create a new Server 2016 licensing server as the session hosts require a Server 2016 as well. 

I have created the new licensing 2016 server, activated it, added it to the AD group of terminal server licensing , added licenses. 

Then I added the new server as the RD license server of the RD deployment and chose 'per user" licensing mode. There is no other RD license server listed in the configuration or in the server list in server manager. I can confirm that with powershell command:

PS C:\Windows\system32> Get-RDLicenseConfigurationMode                 LicenseServer----                 -------------PerUser             {HostRDL2016.XYZ.com}

When I run RD Licensing Diagnoser, the server that is diagnosed is the old server (Server 2012), not the one I created. 

How can I fix this?