I’m on ps5 and my buddy is on Xbox 1. We tried to join a server together and it’s giving us this error. ( I made sure it’s cross play and everything) please help

I got a huge base on high pop official, it's got enough upkeep for 3 days and a lot of teas. The base is loaded tons of aks and full metal kits jackhammers etc lmk

It shows me this every time please help