Quick answer: "Invalid Steam token" = invalid GSLT or wrong IP. Create new token at steamcommunity.com/dev/managegameservers (app 730, current server IP), set as +sv_setsteamaccount in panel.
If you landed here: CS2 srcds shows "Invalid Steam token", "No steam account token was specified" or server won't start despite correct map.
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Frequently asked questions (FAQ)
What is the CS2 GSLT token?
Steam game server login token from steamcommunity.com/dev/managegameservers. App ID 730 (CS2). Registered per server IP, in launch params: +sv_setsteamaccount TOKEN
Invalid Steam token after IP change?
GSLT is bound to server IP. On new game server create new token with current IP and enter in panel.
Do I need GSLT for CS2 dedicated server?
Yes – without valid token srcds won't start or players can't join. Free with Steam account.