Ignore SAML logon for shared links

I have a working SIMPLESAML with Owncloud 9 configuration, where I force logon through SAML.

When I share a link to a foreign emailaddress, the visitor is also forced to the SAML IdP for logon, but this visitor is unknown to the IdP.

Is there a way to bypass SAML logon for shared links and use Owncloud internal authentication for this?