https://i.imgur.com/c2XooJO.png
I have used them on digital movies just fine at no extra cost.
You also can use them on the AMC App just fine.
Quote
Subject to surcharge for 3D, premium large scree format (IMAC, AMC Prime), alternative content, dine-in-theaters,
Virtual Reality (VR), film festivals, special theatrical presentations and premium service; location surges may also apply
at select locations, including Disney and Universal properties operated by AMC. AMC reserves the right to change these terms and contions without notice, including changes and additions to surcharge fees, restrictions or exclusions. AMC Black tixckets are exchange items that are
NOT eligible toward earning AMC Stubs rewards either at time of purchase or time of redemption. Valid seven days at week.
Virtual Reality (VR), film festivals, special theatrical presentations and premium service; location surges may also apply
at select locations, including Disney and Universal properties operated by AMC. AMC reserves the right to change these terms and contions without notice, including changes and additions to surcharge fees, restrictions or exclusions. AMC Black tixckets are exchange items that are
NOT eligible toward earning AMC Stubs rewards either at time of purchase or time of redemption. Valid seven days at week.