Small update: certificate status is now OK.
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Couple of sanity checks:
Make sure that in the configuration database in AF the AuthenticationMethods attribute is marked as "Configuration Item"
Add the site to Trusted sites in IE.
Make sure the Custom level settings don't have Anonymous logon selected under User Authentication -> Logon
One last thing: a lot of times after installing a self signed certificate, the browser still prompts to the "Certificate Error" page. And at the same time the certificate's details will show that "This certificate is OK". Logging out and in should help (see this video: OSIsoft: PI Web API I Online Course- Setting up PI Web API for a Development Project - YouTube), or alternatively reboot client machine.
Yes it was the configuration item property! thanks for the help Anna!
The web browser might not give you enough information to troubleshoot the error "Message": "Authorization has been denied for this request."
I suggest using Postman Postman - Chrome Web Store or Fiddle Download Fiddler Web Debugging Tool for Free by Telerik to see your respond message. Also, those tools will allow you to enter username and password if you are using Basic Authentication.