Unable to connect Chamberlain garage door opener via 5g internet

I did get an extender - set up as a wireless access point - to work.  But in the end, all of these are just KLUDGES.   The T-Mobile Home Internet simply does not work as normal ISPs do.   I suspect this is simply because they are probably paranoid about how much bandwidth will get consumed. But there are other ways this gets limited in any case - which should be sufficient.  Poor design.  I strongly recommend using your own home router (connected to the THI gateway) to overcome a host of issues related to this T-Mobile design.

At some point I am going to try out Verizon mobile internet and see if it has similar issues.  I am not expecting that it does.