Hi --

We've noticed that LTI Dynamic Registration in our beta instance seems broken. The `openid_configuration` that we're receiving back from Canvas contains a `registration_endpoint` of "https://sso.beta.canvaslms.com/api/lti/registrations" instead of the expected "https://canvas.instructure.com/api/lti/registrations".  The sso.beta.canvaslms.com URL doesn't work. 

We're only seeing this in the beta environment so far, but I'm concerned that this bug will get pushed to production.

cc: @xmoffatt 

--Colin