We are migrating our SharePoint 2013 to SP Online.
In current SharePoint 2013 setup, we support and collaborate using SAML based authentication for multiple partner IPD's with proxy setup. We allow users to choose their IDP's from our custom page and user will thereafter be redirected to their's IDP's to authenticate.
We would like to consume this on-premise setup and provider authentication to all our Partner IDP's to our SharePoint Online tenant.
How do we achieve this? Any documentations or suggestions would be highly appreciated.