I am having this same issue "There is an issue with your Electronic Arts account which will prevent SWTOR purchases until resolved. Please contact customer support (https://help.ea.com/en-us/help/star-wars/star-wars-the-old-republic/swtor-support) for further assistance."
I tried changing the password for the EA account, incognito, other browsers, no change.
Swtor user name: Ecarco
Please help
Your account has been sent to studio for fixing ( there is no timeframe ) they should email when it is fixed
to subscribe for now, if you install the game via steam and login and play on a character to be sure the accounts are linked , you can then subscribe via steam whilst this gets sorted
