Hi Shabin Suresh1,
I am Dave, I will help you with this.
Windows 11 allows one RDP connection, not multiple simultaneous connections at a time, for more than one connection, you would need a server version of Windows,
I apologize, Community is just a consumer forum, due to the scope of your question can you please post this question to our sister forum on Microsoft Q&A (The System Administrators and IT Pro forum)
Over there you will have access to a host of System Administrators and IT Pro experts and will get a knowledgeable and quick answer to this question.