Remote in to local PC

Good day all. I have TS installed on several of my PC’s here at home (WIN10). I have used my github credentials to log in. I am able to access shared files between machines using for example. I am also able to ping said machines.

I have the TS client installed and running on a PC (WIN10) located at one of my colleagues home. I used the same github credentials. I am unable to ping that PC or access shared files / folders on that machine. Nor can I access any shared files / folders on my local PC’s when I am on their premises.

Obviously, there is some aspect of TS that I am not grasping. Your time and assistance would be greatly appreciated. Thank you and have a wonderful day! Peter