Hi @LM_EdTech,
Apologies, there may be a slight misunderstanding here. You can only have one discovery page, which would list the different login methods for students/teachers or parents (like institution.instructure.com/login/saml or institution.instructure.com/login/canvas). This could be simple links, or something like the imaged in the screenshot I shared. When you set up a discovery page, every user would see that page when clicking on a link if they aren't already logged in to Canvas. They would then click the applicable item on the discovery page to get themselves logged in.
I think you likely have multiple login providers set up right now, but don't have a discovery page. This is just a guess though on my part.
-Chris