Federating multiple domains with Google Workspace (IdP)

We have 2 domains in our org, with these being added and verified in our Google Workspace and M365 tenants.

We've setup federation between our Entra ID (SP) and Google Workspace (IdP) for one of our domains using the steps in this article. However, when repeating the same steps to add our other domain we run into the following error.

New-MgDomainFederationConfiguration_CreateExpanded: Resource already exists.

I've found this article, but it looks to be only applicable to on-prem AD and uses deprecated PowerShel modules (which don't work on Mac).

Has anyone managed to federate multiple domains with Entra ID and Google Workspace?