have flagged , however it will be monday before i have a response.
most common issue is the linked ea account needs a password reset , if you put any emails used on your swtor account into the below link and reset the password , one of them may be correct
use the following link to reset the password https://signin.ea.com/p/web2/resetPassword
once you do that it is best to use incognito mode on chrome to be sure the browser cache and cookies arent caching the maint page
if you get it resolved let me know and i will remove the flag to support
Glad to hear you resolved the issue
