I want to migrate customers to Auth0 without asking customers to make changes to the existing configuration in their IDP.
To achieve that I need to change the entityId (which I was already able to do in Auth0) and change the check that is done in the Destination field in the SAML incoming assertion.
This is to avoid this issue:
Destination endpoint https://xyz/sp/ACS.saml2 did not match https://abc.us.auth0.com/login/callback?connection=okta-test-me
The question is, can I change the expected Destination endpoint?
We have the exact use case and face with the same problem. Were you able to figure out a migration strategy where Auth0 does not fail on Destination? e.g. whitelisting ACS url on Auth0 side?