Hotspot connects no internet

[Hyperman99]

Strange issue. I know there is an Apple suugested work around on this but I am curious to know if anyone has experienced this. I have a MacPro M1, running latest software. The past 5 years I had an iPhone SE, when I needed to connect to it as a hotspot, not problems! The SE died in May of this year (5 years to the day I bought it!) and I replaced it with a 16E. Swapped SIMs, otherwise everything the same. WHen I went to use the hotspot a few weeks ago, Macbook connects, but no internet. I tried my iPadAir with the 16E, no problem! I have an old 2015 Mac (running a few versions of sw behind) and it connected to the 16E and had internet. I looked at the details of that connection, when connected to the 16E it had a 172.x.x.x IP (Private IP, dynamic DHCP). going back to the M1 Mac, when connected to the 16E I had a 192.168.x.x IP. To get things working, I set the IP manually to a 172.x.x.x IP and everything worked. Going back to the home router, I had to reset back to the 192.x.x.x IP. SO I have a work around, but it is annoying. Had anyone else experienced this, if so, is there another solution? This was the suggested solution in Apple community .. I have not tried this (I don't want to screw up my home internet connection but perhaps I am being too cautious on this) https://discussions.apple.com/thread/250721256?sortBy=rank