My main Windows machine is a Dell 8930 running Windows 10 Pro 20H2 + updates. I have two laptops - an HP Laptop running Windows 10 Pro 20H2 which I keep in the family room and a Macbook Air running Big Sur 14.3 which tends to stay in the kitchen area - and is also the one I tend to take while travelling (smaller - lighter). More often than not, I am doing RDP from the Macbook. It generally works just fine. But if I do RDP from the HP (which will also work just fine) THEN attempt to run RDP from the Macbook, after the messages that RDP is configuring the Windows host, I get a blue screen with "Please Wait". If I go back to the HP, it's hit or miss as to whether it works or not, but the Macbook RDP client fails for any new attempts to connect from that point on with the blue screen and "Please Wait".
I am using the standard Windows RDP client on the HP , and the Microsoft RDP client 10.6.5 on the Macbook running Big Sur 14.3.