Oh wait it’s not actually blocking. It is actually just a warning. I was misleading other Play Store errors.
Oh no, wait again… Well I can’t really understand as it’s a warning (errors are now solved, they was symbolized by a red exclamation mark), but the “start implementation on the channel” button it’s still disabled.
BUT
it’s solvable by CLI
cd platforms/android && ./gradlew bundle
or by android studio manual build.