Hi @Swivel1660 ,
Thanks for reaching out.
I understand that you are trying to federate accounts from different Entra tenants, but not able in sign in with those accounts directly. Please let me know if my understanding is not correct.
In, external ID for customers Microsoft Entra ID Sign up option is unavailable as of now. However, customers can sign up as local account using an email from another Microsoft Entra organization.
Is there a way I can edit the Entra External ID login screen to include a 'Continue with Entra ID' button for B2B customers to use to login? Even better, is there a way enable Home Realm Discovery to allow the login to handle both Local Accounts and Entra ID accounts?
As of now, this feature is not available in External ID. I would suggest share you feedback here for future enhancements.
https://feedback.azure.com/d365community/forum/22920db1-ad25-ec11-b6e6-000d3a4f0789
Reference - https://learn.microsoft.com/en-us/entra/external-id/customers/concept-supported-features-customers
Hope this will help.
Thanks,
Shweta
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