Paying for Xfinity Mobile but cannot access mobile self-service; need transfer PINs or restored access

I am [Edited: "Personal Information"]. My Xfinity account shows I am paying for mobile service, but navigating to Xfinity Mobile self-service hits technical difficulties / errors and I cannot see or manage my lines. I therefore cannot obtain transfer/port PINs. Comcast Business portal for my related business account shows closed and also does not expose mobile self-service. Please escalate to someone who can restore mobile self-service or securely issue transfer PINs, and provide a case/reference number. I can send verification details by private message to Xfinity Support.

— [Edited: "Personal Information"]