my Roku tv has 1 letter off of the right email address that my expresses are linked to. so I'm getting double charged and we never could figure out why. after a yr I just noticed the tv is off by 1 letter. of course i don't have that email and don't know how to change it.
I would go into the "wrong" account and unlink it, and/or factory reset the Roku, and then connect it to the account you prefer,
Oh and delete all the extra subscriptions from the "wrong" account. I would do that first.
I hoping not to have to do a factory reset which is what i was afraid I'd have to do. because stupid me in a yr never once looked at the email since the day i set it up just thought Roku messed up. but that's a yr of recordings and alot hasn't been watch just to watch on certain days or afternoons with family when we binge watch our shows. not sure how to unlink it and relink it to another email I didn't see that in settings
Hopefully you can go to https://my.roku.com and log into your second account using the "off by one" email address as your login name. If successful: