Can't connect to another xfinity user on nintendo switch

[kargion]

I have hit a weird issue.  I can't connect to to a friend who is in the same town as me on xfinity. I can connect fine to my friend who is on an different ISP provider.  This only happens on nintendo switch.  We have port forwarded all the needed ports for nintendo switch and we are still seeing the issue.  We have also tried putting the console ip's on dmz and still no luck (so we reverted this change).

The only thing that worked was when one of us put our switch on a mobile hotspot we were able to connect.  This is very weird.  I think it has to do with most nintendo games being p2p.  

Any help would be great.  We both have Nat Type A on the switch.  This is a hard issue to track down any information on since its related directly to us both having xfinity and we are like 15 mins apart from each other in the same town.

[kargion]

So we did some more testing.  It looks like all games on the switch wont let us connect P2P.  We are working on testing some direct connection PC titles to verify again if it's just the switch.

I reached out to some IT colleagues and they are thinking its xfinity since all the router settings are set up correctly and been tested other people out side of xfinity.

Since a p2p connection would be sending information back and forth between us is comcast blocking that thinking its a DDOS attack?  We turned off the firewalls and DDOS protection but that didn't do anything to fix the issue.  Could they be doing it somewhere out side our gateways?