too many redirects error/page isn't redirecting properly

On attempting to log into my Discourse install, I am redirected to the WP login page.

Unfortunately, on adding username and password, I receive an error:

In Safari I receive a ‘Too many redirects trying to open…’

In Firefox a ‘This page isn’t redirecting properly’ error.

The URL it is trying to access as (copied from the Firefox address bar) is

https://example.com/discourse.example.com/session/discourse.example.com/session/discourse.example.com/session/discourse.example.com/session/discourse.example.com/session/discourse.example.com/session/discourse.example.com/session/discourse.example.com/session/discourse.example.com/session/discourse.example.com/session/discourse.example.com/session/discourse.example.com/session/discourse.example.com/session/discourse.example.com/session/discourse.example.com/session/discourse.example.com/session/discourse.example.com/session/discourse.example.com/session/discourse.example.com/session/sso_login?sso= [STRING REMOVED]

Any advice on what may be the source of the issue??

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For anyone else who may experience similar, you can disable SSO via the command line so as to access Discourse again —?see https://meta.discourse.org/t/disable-sso-while-not-signed-in/18770/2