Redirected to 404 After Logging In

Hi, All:

I experienced this issue recently and solved it. I am posting here to help others who encounter this behavior. WordPress version 5.8.2

It is caused by the admin verification that happens at intervals right after logging in. You can disable this verification nag by using this code in functions.php https://www.intelliwolf.com/disable-wordpress-admin-email-verification/

Hope this helps.