Facebook/Meta/whoever

I have used every email that I have and facebook "meta" still does not recognize it.  Yet for some reason I can use a certain browser that is already logged into one of those emails and facebook will let me log in.  However, no matter what I do to view the email associated with the account or to even change it, I get nothing.  So, apparently my facebook account is running without being associated with an email account, or its being run by one that I do not have access to for some reason.  I dont know what is going on here.  But I have tried exporting my data and all of that, but I cannot find the email that you guys have associated with my facebook account.  It does no good for me, if anything ever happens to the extent I NEED that email to be able to log back in manually.  SO please tell me what is going on with meta.  Every since all of this was taken over by META its been a hot mess.  Facebook should be one account, Meta should be a completely separate account.  Somewhere the linking accounts is getting screwy.  I want to know WHAT EMAIL MY FACEBOOK ACCOUNT IS LOGGED IN AS.  otherwise Im going to wipe it clean and save you guys the trouble, because I dont know who has access to it at this point.