Did Royale API need a written permission to use Supercell's Assets?

I created an Android app using Supercell fankit and apparently it got rejected (from Google) because I did not have permission from supercell to use assets like chests, book of books, gem, emotes, etc. SML, did you have to contact Supercell directly for a verifying document? If so, how long did it take for Supercell to reply? I am currently at one week and counting . . .

You should familiarise yourself with the fan content policy