Unable to join friends server

Summary: me and my cousins all play on a world he has and we usually never have many issues but recently whenever I attempt to join the world a red text appears prompting an error this happens to everyone that is attempting to join we have all tried troubleshooting we have made many new worlds completely wiped all data including 7 days saved data and it continues to happen we have tried most if not all the things to start fresh and fix the issue.

Game Version: 20.6 (b9)

Platform: Steam

OS/Version: Windows

CPU Model: Ryzen 7 5800x

System Memory: 16 gb

GPU Model and VRAM: Nvidia 1660 geforce 1660 super

Screen Resolution: 1920x1080 (16:9)

Video Settings: ultra

Game mode: MP client

Did you wipe old saves? yes

Did you start a new game? yes

Did you validate your files? yes

Are you using any mods? no

EAC on or off? on

Status: NEW

Bug Description: bug wont allow anyone to join besides host

Detailed steps to reproduce the bug:

1)host loads server

2) players attempt to join server

3) f1 screen pops up with red text

Actual result: f1 screen pops up during the loading screen game will not finish loading only way to exit is alt f4 and or task manager force close

Expected result: I expect to join :'(