Two PS5 one network

Are there other consoles or devices that also have issues in the home?

Yes but the other consoles are used solely for single player games. Ps5 is the only one where we have the issue since it's the console we use to play together 

Go ahead and send us a DM with your name and address. We can look more into this on our end. We look forward to working with you. 

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@NoGoodNamesLeft4Me​ 

Which router do you have? (Are you using a Comcast/Xfinity or another router?) I have the newest Xfinity router 

Do you have separate PSN accounts or one account with sub-accounts? Separate accounts (Assuming that's still a thing.)

Have you tried disabling UPnP on the router and then tried assigning static IP addresses? Yes still no change 

Have you tried other NAT types on the PS5s? Can you open the NAT filtering on the router? The Xfinity routers no longer allow changes to be made to the nat and I believe this may be the issue 

You may have to use port-forwarding for one of the PS5s and a DMZ setup for the other. (I know if I did that, I would want a second router just to put in front of the PS5 in the DMZ to keep from exposing it to other network traffic.) I currently have one in dmz and one setup with port forwarding

Honestly it really has me stumped on what may be the issue that's why I stated that it has to be a Xfinity issue. I have even purchased high end gaming routers and the issue remained. I appreciate all the info you provided and for you taking the time to reply 

The newest Xfinity router is the XB8, right? I have yet to find a decent User Manual online for that router. The closest I found was this one at fcc.io, but it's incomplete, which makes it really hard to make any suggestions.

When you had the gaming routers, did you take the Xfinity router out of the mix or just put it in bridged mode? (You would need a separate cable modem to remove it completely, so I'm guessing you used it in bridge mode.) I have a cable modem and my own router, so I have good control of the routing.

Have you tried running one of the PS5s through a VPN? That would/should make that one appear at a completely different IP address and tunnel all the traffic from the PS5 outside of Xfinity's network. The one in the DMZ might be a likely candidate to test. If you can find a VPN provider that has an endpoint near the PSN data centers, you might not be able to tell the difference. (I'm assuming Sony has data centers somewhere in the US.)