Plex Windows app question

Hello I already bought an android account which is active on both my phone and tablet, both work fine. Now I have installed it on both my win 10 pc at home and at my win 10 pc at work. Now when i want to use the windows app it asks me to log in with a plex account or pay. Since I already have a working account I try to log in the win app and it tells me it does not exists? Ok I must assume I need to pay again for the windows app I suppose, unless I do something wrong. Ok now if I buy the windows app will I need tu buy it for all my 3 pc’s or do I need to buy it once and it would be activated for all my pc’s, which by the way are all bound to the same microsoft windows account for windows store. Thanks in advance for the answer.
Best regards.

Since you do not have a Plex Pass (An active Plex Pass gives you access to most, but not all, applications.) you have to buy each application separately. You are not buying Plex but rather you are buying the use of the application.

I believe if you buy the application for a given platform you have bought the rights to use it on that platform on as many computers as you want that use the same account.

ok, thanks, well what has been the case for the Android since I bought it once and it’s active for both my tablet and phone.
thanks