Unable to connect Chamberlain garage door opener via 5g internet

I had the same issue today and upon digging further, I was able to correlate my issue to the current version of firmware on the Nokia device.  It automatically updated 23 days ago and that was exactly the same time the MyQ app was saying it was offline.

I proceeded to reboot the modem with no change.  I think learned the MyQ to a phone hotspot and it worked fine so I knew the issue was with the T-mobile ISP service.  I then tried to reconnect the MyQ to the T-mobile and it still didn’t work.

The final step that fixed my issue was to perform a factory reset (not just reboot) on the Nokia modem from T-mobile.  I am happy to report that it my garage door is back to working normally now.

i spent time with T-Mobile support last Wednesday.  The tech acknowledged that the Nokia router does not have port forwarding active at this time.  there are efforts in work to address this ‘feature’ which is causing MyQ to not connect.  No ETA on the ‘fix’.  

Still having issues.

Configured one garage opener to use the HotSpot on my TMOBILE cell phone, the garage door works fine in MyQ app.

The other garage door thats on the TMOBILE home WiFi still doesn't work.

TCP 8883 is blocked either in, out or in both directions on the TMOBILE home router

My original gateway worked well with the Chamberlain door and MyQ app. It was when the T-Mobile gateway was replaced due to its buffering and freezing issues that it no longer connected. T-Mobile claims nothing changed between the gateways. Replacement was a refurbished unit, the same model.

This is an update to my original post. 

Having the same issue. Both of my Chamberlain garage openers worked fine up till 36-48 hours ago and then became unreachable in the MyQ app.

I figured TMobile changed something, like a blocked port (i.e. 8883). 

To test this, I reconfigured the Garage openers to use my Verizon Hotspot and everything worked fine.

Looks like Tmobile added some filtering.

Please fix this or give us the ability allow exceptions on the router.

I have spent hours on multiple calls to both T-Mobile and Chamberlain. Each points the finger at the other. No resolution yet! So frustrating to have a smart garage door opener that is not. 

IMO, the change has to come from Chamberlain to have the MyQ server listen to open ports.  They will claim they use this port for security purposes.  Hardwired connections like ATT might be secure enough to have the port open, not so much with 5G internet using the cellular network.  I doubt T-Mobile will open the port (8883).  

The more complaints Chamberlain gets, the more likely they might take action.  Open a ticket with them.  I pointed out to the Chamberlain support tech that this issue will only grow in frequency and just marking it as a known issue wont make it go away.