The custom fields have been created but are not present in the API response call. How do we add the fields in the API response?
You will need to ensure the new Custom Fields are accessible by the Projects and the Portal double check this post for extra information on this error
https://community.atlassian.com/t5/Jira-Service-Management/Service-API-custom-field-not-valid-for-a-Request-type/qaq-p/662184
Your errors are clear - those fields are not configured to be used on the request type you are trying to make.
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