Last week I had a functioning sidebar Instant App that was accessible to the public, but today when the link to the app is clicked, a message appears that says 'Item not available.' This happens in Chrome, Microsoft Edge, and Firefox.
I can open the web map featured in the Instant App and experimented with changing the basemap in case the one I originally used could not be shared publicly but that didn't help.
I can open the Item Details page for the Instant App, but if I click View or Configure, I get a blank page with a spinning blue circle.
If I look at my content on the Instant Apps app page, the preview card for my corrupted app says 'Map: None' whereas the others correctly show the map associated with the app.
This same scenario has also happened to at least one other Instant App created by my organization.
Any ideas on what may have happened and/or how to fix it?