Using a 2021 iPad Pro, the Apple Keyboard for this product and the latest version of Remote Desktop there are two non functional items.
1. You can no longer switch between Windows (Alt+Tab on host OS) using the Option + Tab key, nor does there seem to be a method to manually bind this combination in the app.
2. A PowerShell terminal will not accept any keyboard input (both regular and Administrator). The ISE PowerShell terminal will work and command prompt does as well.