Hello,
We’re on ArcGIS Enterprise Portal 12.x. Due to cybersecurity, the Portal cannot access/activate Living Atlas, but client browsers can access the internet.
We currently use Light Gray Canvas services.arcgisonline.com/arcgis/rest/services as a tiled MapServer. In our apps, it appears to stop zooming in around ~1:9,000 (max LOD), and we need more detailed zoom levels, without labeling.

Questions:
Is there an Esri-hosted Light Gray Canvas MapServer (tiled) that supports higher/max LODs (beyond ~1:9k)?
If not, what’s the recommended Esri approach to get Light Gray Canvas with higher zoom in Enterprise apps? (Vector tiles?)
Since Portal can’t reach Living Atlas, but clients can reach the internet, what’s the best practice to register the basemap in Portal (as an item) and then use the Portal itemId in our app, while the tiles load directly from Esri/AGO?
Thank You,