Hi @Shannon McC ,
Thanks for reaching out.
Entra (External) ID For Customers might not support Microsoft Accounts? It seems that Google accounts will be fully supported with single-sign-on, but not Microsoft Accounts!
Microsoft Accounts are fully supported in Entra ID for customers. However, you do not require any configuration to set up to allow users to sign in with Microsoft Accounts.
You can directly sign up the user with their Microsoft Id which will send them a code to create user in CIAM tenant.
Will it be possible for a single Entra tenant that can have a mixture of people signing up with self-managed passwords and others using Microsoft accounts or even full Entra accounts as guests from other, full, tenants?
Yes, External ID for customers allow to sign into application available to multiple consumers using different identity providers Google, Facebook as well as from Microsoft accounts and Microsoft Entra Id accounts.
For the situation I have, which will be a desktop and web application that needs to support 'unmanaged' customer users with self-sign-in (and ideally all the nice branding control of Entra ID for Customers0, but also ideally would handle both Microsoft accounts and accounts belonging to full EntraID tenants (because many of the users will have their own Entra IDs belonging to their companies), would Entra ID for Customers be the right choice?
Yes, customer identity access management (CIAM) solution is best solution which allows businesses to build customer-facing applications and then allow anyone to sign-up into those applications with no restrictions on user account.
Hope this will help.
Thanks,
Shweta
Please remember to "Accept Answer" if answer helped you.