What phone are you using? Does it have band-71?
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no carrier will guarantee indoor coverage...ever.. as is each of them have was to work around problems like this with things like Wifi Calling as well as signal boosters...if its a office building and they have an IT department they might opt to contact TMO and see what they can get installed to cover everyone in there.
Oftentimes we need your help in getting enhancements made approved by local planners and decision makers. I'd definitely recommend checking out the link at the bottom of signal troubleshooting so you can sign our petition.