Yes! As long as a coupon code has not already been previously applied on that subscription (if so, see this guide, here).

Go to the People tab.

Find the end-user's account.

Click 'Edit'.

Click on the 'Access' tab.

Click the 3 vertical dots to the right of their active subscription. (If you don't see this option, this means they have already applied a coupon code, see this guide).

Click 'Apply Coupon'.

Select the coupon code to apply.

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