Forms in email in general is technologically quite difficult and currently has very low support and functions very inconsistently. There's further information on this along with a breakdown of what is compatible here: https://www.campaignmonitor.com/blog/email-marketing/2007/11/how-forms-perform-in-html-emai/
For the moment the compatibility and realiability of this is too low to justify the work required to rebuild forms to be compatible with email. However this is something we may consider in the future if the compatibility of forms in emails improves.
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