WP Login refreshing and redirecting, why?
How to Fix Login Error on WP
When your login page keeps refreshing and redirecting it back to the login screen, it is probably as a result of the above stated errors or issues. So let’s take a look at how to fix the WordPress login page refreshing and redirecting issue.
Delete .htaccess File
Restore default Theme
Check Website URL
define( 'WP_HOME' , 'https://mywebsite.com' );
define( 'WP_SITEURL' , 'https://mywebsite.com' );