You need to call join() on the tags list, not the individual tags. Try with:
jq -r '.tickets[] | [.created_at, .id, .via.channel, (.tags | join(","))] | @csv'
You need to call join() on the tags list, not the individual tags. Try with:
jq -r '.tickets[] | [.created_at, .id, .via.channel, (.tags | join(","))] | @csv'
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