Issue with post request to admin-post.php

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(Revised answer)

I have changed my action to yours but it still doesn’t work. Here is
my repo for this plugin if you want to see. I’m at a loss at the
moment:
github.com/SeanDez/frequentVisitorCoupons

So I tried and tested your plugin, and noticed that you’ve got two “actions” (i.e. action fields) on the same form.

  1. <input type="hidden" name="action" value="handleNewCoupon" />

  2. <input type="hidden" name="action" value="fromNewCouponForm">

So by now, I bet you know what happened?

I.e. The posted action is fromNewCouponForm instead of the handleNewCoupon (which is the correct one?). And since there’s no action hooked to admin_post_fromNewCouponForm, then you got the blank (wp-admin/admin-post.php) page.