Google mesh setup to T-Mobile gateway

Yes  I have a Google mesh set up with my T-Mobile internet. Do you still need help. You just have to add the Ethernet cable to the router they gave you and start te mesh setup. It's pretty simple.

I realize my response to this question is a bit late, but I just finished figuring this out which took me some time, but my 4 puck Google Mesh wifi is working!  I talked to T-Mobile and they told me our Wifi is very strong (even though the tower says "Low").  He advised me to contact Google about the mesh setup, suggesting that we may need to get the mesh system that comes from them.  I finally figured out I needed to reset the pucks and after a few hours was able to get them all working. I went one at a time, starting with the wifi hookup to the main puck via the ethernet cable. Reset button on back of puck, then followed the other directions.  I had to relearn what the colors and flashing means as this system hasn't been used in a while (was lazy about getting it set up).  But it now works!

This link was helpful to me!  https://support.google.com/googlenest/answer/6191584?hl=en#googlewifipointlights&zippy=%2Cnest-wifi-router