When I try to join Server 1 it says "Disconnect: Steam authentication failed.". I can join S3 and any other server without a problem and when I try to join S1 with my alt it works perfectly fine. I tried: restarting my PC multiple times, reinstalling Gmod, verifying the cache.
Any tips are much appreciated!

When I try to join Server 1 it says "Disconnect: Steam authentication failed.". I can join S3 and any other server without a problem and when I try to join S1 with my alt it works perfectly fine. I tried: restarting my PC multiple times, reinstalling Gmod, verifying the cache. Any tips are much appreciated!