Red box Error when submitting form on AMP page

CROSS POSTING HERE TOO

So apparently CF7 still doesn’t properly support AMP and I’m using a plugin to get it working.. (AMP Contact FORM 7 – AMPCF7) and when you submit the form, its says
“Failed to send your message. Please try later or contact the administrator by another method.”
in that red box no one likes to see.

what, how, ideas, or ???? to get this fixed?

Of note: submitting the form is generating a 403 error:

POST https://www.yugioh-world.com/wp-admin/admin-ajax.php?action=ampcf7_submit_form&_wp_amp_action_xhr_converted=1&__amp_source_origin=https%3A%2F%2Fwww.yugioh-world.com 403
(anonymous) @ v0.js:formatted:4456
Promise.then (async)
f.Eg @ v0.js:formatted:4449
Xg @ v0.js:formatted:4464
f.fetch @ v0.js:formatted:4486
push.f.l.L @ amp-form.js:809
$b @ amp-form.js:778
(anonymous) @ amp-form.js:574
Promise.then (async)
Pb @ amp-form.js:547
(anonymous) @ amp-form.js:428
Promise.then (async)
push.f.l.ea @ amp-form.js:304
tg @ v0.js:formatted:3996
f.execute @ v0.js:formatted:3905
aj @ v0.js:formatted:7425

v0.js:formatted:589 Form submission failed: Error: HTTP error 403???
    at cb (https://cdn.ampproject.org/v0.js:23:169)
    at $a.f.createError (https://cdn.ampproject.org/v0.js:19:36)
    at https://cdn.ampproject.org/v0.js:166:409
    at new Promise (<anonymous>)
    at Vg (https://cdn.ampproject.org/v0.js:166:344)
    at https://cdn.ampproject.org/v0.js:168:231

The page I need help with: [log in to see the link]