If I buy the game on one platform, can I continue play it on any platform?

Solution 1:

As it turns out, no. Looks like I need to buy at least the base edition of the game again to even play on another platform. Seems that if I were to do so my progression would continue to be shared between platforms (with the exception of deluxe cosmetics), but I'm just getting a 'you've reached the max free trial rank' splash screen.

Disappointing.