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I saw the screenshot on the other thread. To fix this issue, it's necessary to select a request type that has only Summary and Description as required.
Please, go to Project settings > Request types > Edit fields (for the request type you want to use in the email channel) > Request form.
Please, make sure to let all other fields "not required".
After that, go to Project settings > Email requests > … > Configure email request types and select one that has only the summary and description as required.
Please, give it a try and let us know how it goes.
Thank you for the screenshot @CS-L3.
Just for a better understanding of the issue, I would like to know if this is a brand new project or if it was migrated from another Cloud or Server site.
Are you facing this issue on other projects?
If there are no other Service Desk projects, can you create a new one in order to test?
Usually, when enabling the email channel, it will be the project key + the site URL, in your case it would be firstname.lastname@example.org. Can you please check if there are no other projects using this email?
If so, can you edit and add other information and then try to enable it on the project HT again?
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