Site Owner Unable to Login

Site owner is unable to log in! Is there a way to whitelist an IP for allowing user login? Or how to bust through ISP network cache with cache buster code?

When he tries to login, it sends him back the the home screen for unregistered visitors instead of home screen for logged in users. He has cleared his browser cache, even tried from a new computer and a computer reset to factory status. Nothing works.

His IP doesn't seem to matter but he recently got a dedicated IP anyway, just to try it. Same problem. Somehow he is either blacklisted, or is ISP is caching the visitor home page and showing that instead of the logged in user page. ISP is Comcast. Same problem with AT&T. I know Comcast has edge cache layer in their network architecture. Could that be it?

I would suspect caching at AWS, UNA level, or NGINX on server, but as project manager, I can log in and out of site owner account or any verified account all day long.

Does anybody know how to whitelist an IP to allow login? Or if if T-Mobile or Fios Wireless 5G uses edge caching?

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