I have magento 2.4.2 in developper mode
I have bought a theme : alotheme biolife 11 which seems to have magepow, magicart ,magicslider, magicmenu, somes widgets, etc...
I have installed the mollie paiement module in test mode for the moment.
I have installed the free module : advandced shipping from owebia
Disable the theme and extensions that come with that. and review the same promotion. May it will be work.
It seems not to come form a conflict with the extensions/modules/themes (mollie, advanced shipping, biolife alothemes, etc...)
And the strangest, a person of the alotheme support did have a look and it works for him, not for me... I have tried in differrent places (IP adress) , clean well my cache and temporary files in in differents web browsers... always nothing...
Can you check for you if you see the discount?