Hello @Richard Rosenberg
The skip confirmation notification = yes option is obsolete. Due to strict email provider security requirements, now mandates a double opt-in confirmation for all imported email subscribers, meaning they can no longer be added silently.
Since you are on Enterprise, I highly recommend opening a ticket with Atlassian Support directly, as they can sometimes grant temporary exceptions for large internal rollouts or migrations. I have also flagged your post here to bring some extra internal visibility to the issue.
Best,
Arkadiusz🤠😎
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