DivaSquad review for Facebook & Instagram

I cannot access anything, have spent way too many hours on this integration, and Facebook has zero help. I did all the steps, then informed me that someone else is the owner of my pages and won't allow me to go any further. Facebook, I am the owner, admin, ads account manager of my Facebook and IG pages, so where are my emails going so I confirm this? The only thing that I can think of is changing the IG handle. Indeed this is not the reason why I cannot connect. Absolutely rubbish, and far too much stress thinking I have been hacked. I contacted Facebook and tried the links, but that was a dead-end Such a waste of time.