Hello Fernando,
Welcome to Atlassian Community!
When using the email channel, it's essential that one Request type has only Summary and Description as required. All other fields of the request form must be optional.
Can you please go to Project settings > Request types > Select the desired request type > Request form and check what fields are required or not.
Please, give it a try and let us know how it goes.
Regards,
Angélica
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