Cannot start family sharing

“xyz@xyz.com is already used for shared purchases in xyz’s family. Ask xyz to send you an invitation to join family sharing.” I am xyz though. It’s telling me to send an invitation to the Apple ID I’m already logged into. I’m the administrator of the family sharing but this error message pops up when I try to see my family sharing data. I called Apple support and he had to forward me to senior Apple advisor because he didn’t know why this was happening and the senior advisor also didn’t know why this was happening so I have to wait for another higher up department to hear back from. I’m not mad about it or anything I’m sure this problem isn’t that common but if someone has a way to prevent this from happening again or knows why it happened pls answer. I changed my password, logged out and signed in again, signed out of all other devices, updated my settings, turned my phone and off, and still no luck. I’m still not able to see my family sharing. Could it be a hacker? That makes me nervous. Hopefully Apple will have a resolution when they call me back.