I went ahead and emailed customer service about this. I see others have had this issue.
I had the same issue as others had…I bought several codes in Nov 2024 for 3 months of Gamepass Ultimate.
I redeemed one with no issues at the end of November 2024 Tried to redeem the others today and got an invalid region error. I went ahead and emailed Woot customer service, would like a quick response if possible.