If talking about Entity ID and Assertion Consumer Service URL's, it sounds like you're looking to implement SAML Authentication. Just as a side note, this isn't a requirement for MFA logins - local Meraki logins can still be setup with MFA.
That said, take a look at the following document.
It describes where in the Meraki dashboard you generate the Assertion Customer Service URL.
Configuring SAML SSO with Microsoft Entra ID - Cisco Meraki Documentation
There are also other docs that detail SAML setup specific to other IDP's.
