In help section fb I read a section on how meta data users the data from old accounts and mergers together when new accounts are made, say like me in my first account I had in the 90s I turned of notifications then a few years later I had to make a new account with the same email ( always had same Gmail account ) so I think fb uses them settings even if a new account is made my notifications haven't worked 4 over 4 years with 3 different phones and using the same fb account does that make any sense
It's impossible for me to make another account as my phone number and email are used as two step authification and are connected with the Facebook account