2 months have passed and I STILL can't redeem any Rainbow Six Extraction, nor have I heard back from Ubisoft support.
Other titles like AC Valhalla seem to still be working fine.
Nothing works for R6 Extraction rewards; not through Ubisoft Connect, web browser, mobile app - nothing. None of the paid rewards, neither the free ones (all ones unrelated to timed events that are urrently inactive).