I have a couple of questions,

1. Is it possible to implement home realm discovery in Microsoft Entra External ID? For example, in AD B2C we can use the custom policies (IEF) to redirect users to specific IdPs based (for example) on their email ID.

2. When I try add a new custom provider, the label reads "Add a new custom external identity provider supporting OpenID Connect, SAML or WSFed.", however the UI doesn't really give me an option to add OIDC providers: