As a new user, I don't necessarily know what would be a working url to use based solely on "https://anypoint.mulesoft.com/accounts/login/{your_org_domain}". Should provide a working example.

Also, who is going to define or provide "your_org_domain"? Is it going to be a property set during the SSO IdP configuration?

https://docs.mulesoft.com/access-management/update-user-profile-task

When you log into the configured IdP for the first time, an Anypoint user is created using your IdP information.

It sounds that a new user is created without logging into Anypoint Platform.

https://help.mulesoft.com/s/article/Questions-Regarding-External-Identity-configuration says more cleary:

Once signing in with your IdP, a new user will be created in the Anypoint Platform.