I have two are clouds [email b] and [email a]. I am log in with [email a] I’m trying to register the other where they will be on the same account but somehow some has used the other o register and I can’t register the [email b] I wanted to register it also where I have on the same account the [email b] I don’t use for my Apple ID it is used for my iCloud mail I just just wanted to have them both combined as one on my fire fox