On another installation l get a blank page and on the browser console something like "../api/v2/system/environment" 400 error... (get also 404, 500, etc)
Then copy this "../api/v2/system/environment" and put in Postman app and get in the message "Unknown relationship: app_lookup_by_app_id" !
The problem is related with table engine, is set to MyISAM and need to be InnoDB!
I have to change server default mysql engine to InnoDB, then remove all tables in the database, make a new tables installation (php artisan migrate --seed), new df setup (php artisan df:setup) to create the Admin user, clear the cache (php artisan cache:clear) and then all works!
Regards,
LBat