Hey, if you guys still suffering from this error I found a solution for it!
so this happens only when nginx configuration is trying to add a trailing slash to the wp-admin, what you can do is:
- go to conf\nginx
- open the site.conf.hbs file
- add port_in_redirect off; under root “{{root}}”;
And You fixed it! Mark this as a solution if that worked for you so others can find it too!