Hey @Cisf_Jalt you can find all the info relating to connecting your accounts in this help article: https://help.ea.com/en-gb/help/origin/origin/playing-ubisoft-games-using-origin/
@Cisf_Jalt check this thread:
One user posted a possible solution. I think it worths a shot, at this point.
I do not work for EA and i am not associated with the company in any way. I am a player just like you, trying to help wherever i can.I will not answer to any unsolicited PM.