Trying to to pay lotto with my Monzo card but can’t how do I turn on the ganbling park of my account.
To turn off gambling block
Click on the manage part under your card or go to account. Scroll down to bottom and gambling block is there, you can turn it off so long as you didn’t activate it less than 48 hours ago.
In the help guide just type gambling block, it’ll tell you how to do it.
Edit - by any chance is it failing at the part where it directs you to the app to authorise the payment
if so click the option on the lottery page where it wants the code to tell it to send you an SMS
Thanks for that will contact them cheers 
Also, if you are under 18 I think gambling payments may be turned off my default.