Hi @matthew.hartz ,
Yes it is possible to use Auth0 as the Identity Provider and Azure Entra as the Service Provider. I have found some documentation about this. I hope it will help.
Problem statement
We need to make Auth0 the source for users. In other words, Auth0 is the IdP and Azure AD is the SP/relying party. Can Auth0 act as an Identity Provider to Azure AD?
Solution
You can implement this as below:
In the Azure AD portal, go to External Identities in the left sidebar → All identity providers → New SAML/WS-Fed IdP.
In Auth0, this would be a generic SAML setup using the SAML2 Web App addon.
Reference
If you have any other questions feel free to ask.
Have a good one,
Vlad