Integrating moodle-auth_saml2 with auth0

Hi …first time here.
Im trying to make my moodle plugin work with auth0.
Configuration on the side of moodle plugin is very straighforward.
I need to point it to idp metadata url , according to auth docs:

https://YOUR_DOMAIN/samlp/metadata?connection=YOUR_CONNECTION_NAME

Point 1 is done , and server can properly decode the xml provided by auth0
Then…
Moodle plugin provides an xml with the idp metadata.
Im suposed to upload this content on auth0 but can not find where.
Can someone provide some light ?
plugin info is here:
I already tryed manually set the callback url but still seing the message:

AssertionConsumerServiceURL is invalid:

any help would be preciated
leo