Why does discount code on URL not work?

Example, the below URL resolves and discount is applied to basket

https://botsonic.co.za/55904829538/checkouts/ac/fb256ceb359cd925bf33e0e0fd13a5ea/recover?key=a8c9ee246b58c841e7af83afec850432?discount=BOTSONIC

When redirect is added to the above URL, the discount is ignored and not added to basket.

https://app.botsonic.co.za/refer?url=https://botsonic.co.za/55904829538/checkouts/ac/fb256ceb359cd925bf33e0e0fd13a5ea/recover?key=a8c9ee246b58c841e7af83afec850432?discount=BOTSONIC

Why? Bug?

We found the issue…

Instead of passing “…&discount=discountCode” you must use “…&discount=discountCode”