@niosus
THANK YOU, THANK YOU, THANK YOU, THANK YOU SO MUCH!
I have been struggling the last few days trying to figure out what broke on my site to cause this issue. I could only manage to find a workaround by directing myself to /wp-admin/and having the site then redirect me to log in.
Now it works without a hitch! Again, thank you for sharing this fix.
You are amazing!