I am running a 2017 iMac (macOS12.6) and Remote Desktop Mac 10.7.9 (2011). When I'm connected to a 2016 remote session the clipboard will not sync. I have no problems with clipboard sync with a 2019 ...
TaniaMariscal
Microsoft
MicrosoftWe are sorry you are running into issues. To discuss issues we recommend to share your problem on our Tech Community forum (https://aka.ms/wvdtc) or open a support ticket after you have reviewed the troubleshooting options in our documentation (Windows Virtual Desktop troubleshooting overview - Azure | Microsoft Docs)
We recommend to review our troubleshooting section first. The other option you have is to open a support ticket through the Azure Portal.