Generate EmbedToken via PowerBI's API with dataset id only

Hey,

So much like the title says, we've been following all kind of variants of https://docs.microsoft.com/en-us/rest/api/power-bi/embedtoken/generatetoken, but haven't been able to make anything work yet. We'd need to generate a EmbedToken, but since we're using "My Workspace" over on PowerBI, we do not have access to a WorkspaceId. We also use Dashboards (and not necessarily Reports), so we don't have any ReportId's to specify either. This means we'd need to get the token based on only our Dataset ID (or DashboardId, if that helps at all).

Ideas?