Hello DJ, I have the exact same problem. In my case, I previously installed WP and was using the administrative console without any issues.
Now when I go to my website domain, the website/wp-admin link throws a 404 error. This is where I would have logged in previously to make site changes. I thought that perhaps the login URL changed somehow, but I am not seeing that to be the case elsewhere in the support blogs.
I did notice recently that I received a notification that my site automatically updated to WordPress 5.6.6, I am not sure if this is the root cause. My site is hosted with GoDaddy and I am not aware of any changes on their side.
Any troubleshooting thoughts are appreciated.
Dave
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This reply was modified 3 years, 2 months ago by deiben.