Error when trying to log in to Panel

No it can’t login in panel at all. happens on first test and is recurring.
I am using/testing two accounts from my local development environment (mamp). I have tested several config.php option from this thread.

tested both with .htaccess

#RewriteBase /
RewriteBase /

apache rewrite seams to work, as otherwise i could not navigate to my content pages.

in safari console I could dig into a error of app.js line: 13789
d.debug && window.console.error(t), 403 === t.code && om.dispatch("user/logout", !0)