Greetings johncarlorepol,
We understand that after updating your iPad to iPadOS 14.7, a specific song is no longer showing the Dolby Atmos badge.
To clarify, are we working with an iPad Pro 12.9-inch (3rd generation or later), iPad Pro 11-inch, or iPad Air (4th generation)? We ask as those are the models that have this feature available, as per this article - About spatial audio with Dolby Atmos in Apple Music
If so, can you let us know whether you have things set for Automatic or Always On? Are you using headphones with your iPad?
Thanks.