The REST API route definition for mc4wp/v1/form is missing the required permission_callback argument.
Using the plugin on WP 5.5 latest AMP Standard Mode, Gives this above error.
Not added the URL for you to see as breaks the entire page when activated so deactivated.
Read more and found in WP 5.5 a permission_callback argument is required to be true for public virtual JSON Rest API’s.
Otherwise, the plugin does what it says! , if you can help will be good.
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