Incredible credentials after click on login

[cruex-de]

My steam login dosn't work, redirect to steam and another all worked... but after login and click on steam "login" get this error by steam "Incredible credentials" any idea?

i use Laravel 5.5,

EDIT: i know now, this is a server side problem? i use php 7.2 debian jessie and plesk, and bcmath is installed.

[cruex-de]

okay its a steam fail.... sorry