To herlp raise awareness of the Sestertius Project, I would like to enable sponsored transactions. I have tested to do so as it is displayed on https://docs.wavesplatform.com/en/waves-client/assets-management/sponsored-transaction.html webpage, but unfortunately, this option is not activable for my Sestertius asset. Is there something I have missed ?

for information, I have more than 2 waves in my wallet.