I cant seem to login into my magento 2 backend. When I enter the correct credentials it just redirects me to the login page with no error. Debug, system and exception log are clean. Cache is cleaned already.
Thanks in advance!
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This issue also shows up when there's an unknown bug in an extension that affects sales display (the dashboard shows sales data). In my case, I just ported an M1 module to M2 using the extremely helpful but seriously flawed Code Migration Toolkit (https://github.com/magento/code-migration). I then ran the command
php bin/magento module:enable My_Module and restored my database (migrated from M1 to M2). I couldn't log in so I came across this Stack question and others like it telling me to clear cookies and remove rows from core_config_data. After 1 hour of head scratching, I realized it must be the last thing I did when admin login started to fail. It must be the module that I just enabled. So I disabled it and was able to log in.
Inspecting the code, I came across a configuration file etc/sales.xml that the CMT ported over from M1 to M2. This config file was trying to load a model using the old M1 class name
my_module/quote_discount and failing. I commented this out and reenabled the module and was able to log in again.