Since the license:xxx identifier support was added in this commit,
#sv_authMaxVariance 1
#sv_authMinTrust 5
no longer prevents non-Steam authenticated accounts from joining servers in the recent fxserver builds. This results in some odd behavior since there is some finnickyness to Steam at times, so users who normally authenticate through steam sometimes show up with their license credentials, rather than being rejected at join.
It’s possible that this is working-as-intended, if the license:xxx identifier type is coming from SocialClub or something; apologies if this is the case, though it would be nice to know if there are other configuration settings that can accomplish steam-only auth, or a workaround.