New Feature Not Working: OPENROWSET with Onelake

OPENROWSET compatibility with Onelake was just announced as having been released today on the Fabric blog, but I cannot figure out how to get it to work. I use this regularly with ADLS storage with no issues.

I've tried copying their examples verbatim, or tried every alternate combination I can come up with, such as workspace name vs workspace id, URL from properties of file, lakehouse ID, lakehouse name, etc

I get an error: "has URL suffix which is not allowed" like it is still blocked by Microsoft. Does anyone know if this requires activating it in tenant settings to work?

https://blog.fabric.microsoft.com/en-us/blog/announcing-public-preview-onelake-as-a-source-for-copy-into-and-openrowset?ft=All

The documenation says the following should work:

SELECT *
FROM OPENROWSET(
    'https://onelake.dfs.fabric.microsoft.com/<workspaceId>/<lakehouseId>/Files/filename.csv'
);

It was just announced this morning, so they may have just announced it before actually releasing it. i'm not sure.