Same thing happening to me as well. Tried messaging one of the support members but haven't heard back.
for 2 days I have been getting this message, and from what I can see in this forum, I am not the only one
I have 2 phones on a family plan, I can not log into either, I have cleared my cache and everything possible on my end, the issue is on your end.
I am trying to check my hotspot data and billing