Hey there @ricky2 , welcome to the Auth0 by Okta Community!
Thanks for your interest in integrating Okta as one of the available connections on your Auth0’s Classic Universal login widget.
There are two options on how to set it up on the Auth0 side:
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Home Realm Discovery: this doesn’t cover any additional button on the Auth0’s Login widget. Once a user provides their email address, they will be automatically redirected to the SAML IdP( if there is a domain match). If there is no match, Auth0 will prompt them to provide a password (for a regular Auth0 database connection).
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Adding a button for the SAML IdP on the Auth0’s Login widget to be chosen by users.
Please let me know if there are any other questions on that!
Feel free to test the solution with free Okta and Auth0 accounts by assigning a test user to the Okta integration.
Here is a Knowledge Solution to that: SAML setup OKTA as Idp and Auth0 as SP.
Error messages that appear during the connection test should give additional direction on troubleshooting.