Should I buy twice? one PC one Xbox?

I have already merged my Xbox account with my PC one, and although I have spent 700 dollars+ without an access key, I still need to know that this time is cross-platform playing, If I buy a support pack with access, will my Xbox access too? or I have to pay twice like Poe 1?

As far as I have understood from reading other forum posts, and based on the FAQ. My understanding is that early access is not account specific, but rather platform specific. In that a supporter pack purchased on one platform (I.e., PC) is not considered the same as one purchased on a console platform (i.e., Xbox). Therefore you need to purchase EA on Xbox (in game on console) in order to get access to the client, even if you already purchased access for PC via the website. That being said, mtx is not platform specific, but account specific. So whether you play on Xbox or PC, you will have access to all the mtx of the sub-account which you are using. For example, in my case, I purchased the 480 pack on the website for play EA on PC, but as I sometimes play on XBox (with the wife), I will just purchase the 30 pack on Xbox in game for the EA. But whether I play on Xbox or PC, I will have access to all the mtx of the 480 pack (and any others on the sub account which i decide to use). I am not saying that I am 100% correct, but this is what I have understood so far. I have no problem with this personally, as I don't mind giving GGG another 30 euros, but I must admit that it was not clear at first. All the best fellow exiles, and see you in POE2! :)