How to enter promo code on Android device

How do I enter promo codes into Zwift using my Android phone (Samsung Galaxy S9)? I know there is a way to enter it when using a computer by pressing the letter “P” on the keyboard and simply entering the promo code.
Thanks for your help, Keegan.

my workaround (I run Zwift on AppleTV) … I installed Zwift on my Mac Pro, too. Use it just for “non-riding” purposes - like entering promo Codes, change jersey, socks etc, create/modify workouts …

Thanks for your workaround, much appreciated.