Fichier refusé : non conforme

A missing property release is not the issue, except if the file entered the reminder section. There are reasons to refuse this, as the execution is poorly done: the z-Plane is really confusing in your asset, and the shadows do more bad than good.. But I would have refused on the basis of quality issues. 

Why don't you just submit the countries alone and as PNG files (it's really silly to do a rendering and not to include the alpha channel), and you submit the forbidden sign (or signs, as you can do different styles) separatly. 

3D map of France with the french flag in a round red prohibited sign - white background - 3D rendering

 

france, map, prohibited sign, prohibited, sign, round, french, boycott, no entry, criminals, symbol, flag, three-dimensional, country, ban, crisis, icon, signs, illustration, national, 3d rendering, circle, red, blue, prohibit, constitution, danger, geopolitics, freedom, democracy, confrontation, conflict, international, forbidden, business, illegal, exclude

By @thibaultr20691496

Your keywords repeat a lot the same term. If I remember the keyword instruction well, you should not write something like this:

prohibited sign,

prohibited,

sign,

prohibit,

signs