Need help understanding the usage of the "force sync" parameter

[WillowMobileSys]

My use case is an action button that navigates to another app using LINKTOVIEW().

Navigation works beautifully and when exercising the button in the editor a Sync is even is performed when transitioning to the second app. Perfect! Exactly what I want.

However, when testing from the browser or a mobile device, the Sync is NOT performed. So, I need to introduce a forced Sync.

The widely published way to force a Sync is to add this parameter to the navigation link:

..."&at=", ENCODEURL(NOW()+1)

Using a CONCATENATE() to add the force Sync, my expression looks like this:

CONCATENATE(LINKTOVIEW(ANY(SELECT(Apps[Return View], [App ID] = [_THISROW].[App ID])), [App ID]),  "&at=", ENCODEURL(NOW()+1))

This results in the link text looking like that in the image below:

Looks good to me and works great from the editor! However, when the button is tapped from either a browser view or a mobile device - no Sync is performed!!

I did try replacing “&at” with “#at”. A Sync IS performed. On the browser the Sync is performed TWICE then navigates to the refreshed app as expected. On a mobile device, a Sync IS performed and it looks like the app is opening refreshed but then it immediately goes to a blank white screen. I have to close AppSheet completely and re-open to recover.

What am I missing to get the navigation to perform a Sync?