Hi @jsw ,
Thanks for reaching out,
If the email being used in the identifier field definitely exists in one of the Org connections, please check that the connections are all enabled in the Tenant Application.
I think this is the normal behaviour if there is not an Auth0DB enabled in the application and then the domain doesn’t match any Enterprise Connection. but you can customize the text in the error message if you wish, see here, it will be in the Login-ID prompt “no-hrd-connection” , the custom text can be configured in the tenant dashboard >Branding > Universal Login > Advanced Options > Custom Text.
Hope this helps, thanks!