Update:

Step 4: Use the Netsh commands for HTTP to remove the default URL reservation with port 5048 and reserve the new URL with the new port value.

Is never necessary if you've already specified the service user through the XMLEndpointUtility. The utility automatically runs the netsh urlacl commands for the specified user, so you don't need to do so manually afterward.

Also, Forms 12 doesn't have (or need) an EndpointUtility, so don't worry about it being "missing". We'll get the docs updated to reflect.

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I don't think you need to do anything else, especially if it's currently working. I recall that users that are local Administrators do not need explicit urlacl reservations, so if your LFDS service user is a local admin, that may be why. Looking back at the LF11 Configuring the Notification Service for real-time updates on the Tasks page docs, it notes:

Note: You only need to run the second command [netsh http add urlacl url=https://*:8181/ user="LOCAL SERVICE" listen=yes] if the service account for the Hub service is not Local System or a member of the local Administrators group on the machine.

In my experience, missing netsh urlacl reservations result in very obvious "service fails to start" errors.

I'd restart the Laserfiche Directory Server service, then check the Windows Application, Windows System, and Laserfiche Directory Server event logs for any obvious related errors. If you don't see any and things are working (license checks, auth, etc.), you're in the clear.