Add users to the Remote Desktop Users group

You can just create a new user and grant them remote desktop access, the steps are mentioned below:
We will check how to add new users to the server first, please see the below steps to do the same.
How to add a new user account to the server:

1. Click Start, select Administrative Tools and click Computer Management.
2. In Computer Management, click Local Users and Groups.
3. Double click the Users folder.
4. Right click in the users list and click New User.
4. Fill in the information for the new user and click Create. You can create another user. Click Close when you are done creating users.

Add users to the Remote Desktop Users group:

1. Open Computer Management.
2. In the console tree, click the Local Users and Groups node.
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3. In the details pane, double-click the Groups folder.
4. Double-click Remote Desktop Users, and then click Add....
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5. On the Select Users dialog box, click Locations... to specify the search location.
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6. Click Object Types... to specify the types of objects you want to search for.
7. Type the name you want to add in the Enter the object names to select (examples): box.
Click Check Names.
When the name is located, click OK.

You can follow the below path also to do the same:

Right click Computer > Properties > Remote > Select User > Add > Advance > Find Now >
Select any user and click OK.

That’s all!