I have two PC’s both have MSFS installed, but I want to be able to use both at the same time. How do I do that when only one can be used on an account? Do I have to make a new MS account or just an xbox live user profile?
You would need to have bought it on two separate accounts, not just install it in two places.
I haven’t read the EULA but the loosest you would sometimes see would be multiple installs are okay. but only one can be used concurrently.
So yes, if two people wanted to fly together at the same time, you would need two MS accounts, with a copy purchased on each of those accounts.
I don’t think MS offer any family sharing thing like Valve/Steam does?