Our organisation has released a number of publically available data services through ArcGIS Online. These have been tagged within ArcGIS Online and we're able to search and find a number of older data services in this way:

This much is explained in available documentation online:
Add a reference layer—ArcGIS Maps for Power BI | ArcGIS
Recently we've added another publically available dataset and tagged it in the same way however it does not appear as an option within the search results.
Is anyone aware what the governing rules are regarding data appearing in the search? Should we expect publically available ArcGIS Online data services that have been tagged to appear immediately in this way or is there a delay?
Any insight/advice is appreciated. Thanks.