Nintex templates download as I was investigating some issue with their search bar. In the header file, if you have multiple '<input' (like we would normally do for language switcher options) it negates the button being clickable at all.

Custom_Templates/customer_templates/Nintex University/commerce_redeem.html.liquid

@@ -0,0 +1,31 @@
+{% include "header"
+  , color: "var(--nintex--color--deep-purple)"
+  , text_color: "white"
+  , text_en_US: ""
+  , text_es: ""
+  , text_fr: ""
+  , text_de: ""
+  , text_en_GB: ""
+  , text_nl: ""
+  , text_pt_BR: ""
+  , subtitle_en_US: ""
+  , subtitle_es: ""
+  , subtitle_fr: ""
+  , subtitle_de: ""
+  , subtitle_en_GB: ""
+  , subtitle_nl: ""
+  , subtitle_pt_BR: ""
+  , button_text_en_US: ""
+  , button_text_es: ""
+  , button_text_fr: ""
+  , button_text_de: ""
+  , button_text_en_GB: ""
+  , button_text_nl: ""
+  , button_text_pt_BR: ""
+  , button_link: "" %}
+
+<main class="np-commerce-redeem-page np-main np-page-container np-max-width">
+  {% commerce_redeem %}
+</main>
+
+{% include "footer" %}