Unable to connect Chamberlain garage door opener via 5g internet

There is actually a confirmed solution for this as I had exact same issue everyone else is complaining about.

You can't connect directly to the TMO router. It just won't work. 

I resolved this issue with a WiFi extender but you have to make sure it runs separate 5ghz and 2.4ghz networks. Mine was $50 on Amazon. Model shown at this link. 2022 WiFi Range Extender Signal Booster up to 5000sq.ft and 35 Devices, Internet Booster for Home, Wireless Internet Repeater and Signal Amplifier,4 Antennas 360° Full Coverage https://a.co/d/eBZMKlh . Then when you go through the process to add the chamberlain opener don't connect directly you the TMO router but instead connect to the 2.4ghz network created by the extender. Boom. First attempt to connect worked.