Close proximity Xfinitywifi Hot Spots

First off let me be clear I have NO issues of my phone connecting to xfinitywifi or XFINITY hotspots as I walk the neighborhood and most business that have it.

The problem I have is when I am in my mother's retirement community building.  Signals are strong in many places in the building. Residence have to provide their own services. Xfinity and ATT Uverse are the only local options. Some of the building is pretty dead hotspot wise too.

My mother has no personal service, so have to rely on others with Xfinity who's equipment broadcasts xfinitywifi or the secure XFINITY.

Several places like my Mother's apartment have decent signals, but always say failed to get a IP. I can't figure out why unless there are too many xfinitywifi hotspots and they get confuse. Any idea how to correct the issue?