I am not sure of this the right place to post this. I’ve googled and can’t find a clear answer or I don’t know how to word the search to get an answer.
So I am going to try and be clear with this:

Is it possible to have more than one subscription attached to my account?

If it is possible and I purchased FFXIV on a different platform would I be able to play my 2 subs at the same time?

Or are the subs tied to each license and not the account?

And I would I be able to swap them? Like my main character I created on the PS4/5 but I want to log in to the PC with that character. Then my second sub could play on the PS4/5.

Basically, I want to play with my son and be able to swap between PC, PS and potentially XBOX.