Hi, did you figure this out? I am having the same problem. Somehow I have a free Facebook linked acct. with no instragram linked and then I know I also have an instagram one and have been paying for it. I can’t even figure out how to sign into my instagram one. I know that is the one that I set up an automation on and I need to update something and can’t find my account.
Go to the one that is “Free” with the Facebook account linked. Go to ‘settings’, select the ‘messenger’ channel and select ‘Remove’ (scroll to bottom). After you’ve removed it, go back to the paid instagram channel and re-connect it there.