Known issueFixUpdated · 8 replies on Steam
HELLDIVERS 2: PlayFab Problem (Workarounds)
Short answer
Suggested fix (unconfirmed): Use a VPN to bypass the PlayFab connection failure, or wait for the issue to resolve itself like the OP did.
The problem
As many people before me, i cant play HD2 for at least 3 days now. PlayFab connect is failing, but it works fine if i activate my vpn. I DONT WANT TO PLAY WITH VPN ON MY PING WILL BE 5 MINUTES P.S. problem resolved itself after easy anticheat came instead of gameguard or whatever it was called
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Source: original Steam Community discussion. Quotes are shortened; all credit goes to the posters.