How can I can do bulk change of old tickets to a new team owner
Run a search for the issues, then use "bulk edit" from the tools menu at the top right of the display to change the ownership.
Have you attempted to use Bulk change feature? Go to Advanced issue search by clicking into the search bar and selecting it from the drop-down. Enter your JQL to obtain your "old" issues then select Bulk change from the … Drop-down.
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