Windows 11 does not allow multiple RDP or Remote Desktop sessions on one computer. This can only be done on a Windows Server OS. But if you want to enable multiple RDP sessions in Windows 11, you have to make a small change to the termsrv.dll file located in C:\Windows\System32 folder.
Enable Concurrent RDP Connections in Windows 11
Here is how you can enable multiple RDP sessions in Windows 11:
Go to C:\Windows\System32 and locate termsrv.dll
Take ownership of the file
Right click on termsrv.dll and go to Properties. Under Security –> Advanced, change the ownership to your own username.
Open the file for editing
Open termsrv.dll in HxD editor.
To enable concurrent remote desktop connections, locate the following string:
39 81 3C 06 00 00 0F 84 4F 68 01 00
Replace it with the following string:
B8 00 01 00 00 89 81 38 06 00 00 90