Someone please help me

I’ve been trying to get the ATT Smart home manager set up for a few months now and after dozens of calls to ATT I am at my wits end.

I have ATT fiber internet through my property management company for the home I’m renting. When I attempt to set up the SHM app I am asked for an account number, I don’t have this and my property management company is unable/unwilling to provide it to me. When I called the onboarding department (supposedly they are the ones who handle this) they just assume I’m trying to set up a new service and try to get me to open a separate account.

Can someone please tell me what I need to do here? I’m so lost.