Hello Community,
We are setting up email notification when Jira ticket is moved to particular state.
We kept "To" address as empty and added 6 members group address in the "CC"

But when Jira ticket is moved to particular state email didn't send and audit logs shown below error.
"Unable to send emails to any recipients. This may be for data privacy reasons, or because of the way these recipients have configured their email accounts"

after this, we added some user role group to "To" address and then it worked. Mail went to both To address and CC address.
again we removed To address and kept only CC. But it worked.
Our question
1. When we set up only CC, why error shown in Audit log and no email sent.
2. When we add some user role to TO address then no error. email went to both To and CC address.
3. Again after removing To address, Now email is going to CC only.
In our understanding 1st and 3rd scenarios are same but results are different. why this behavior in Jira automation. and what will be the reason for this?
Thanks,