Do you still have the OLD straps? If so, switch an old band to the new watch.
You might want to try a washing of the new band in a solution of Dish Soap and warm water? I would also suggest you elevate your CALL and concern to Apple Support for a different model band.
Get Support – Apple
https://getsupport.apple.com/
Call Customer Support (800) MY–APPLE (800–692–7753)
or online https://getsupport.apple.com/
or call AppleCare Support at 1-800-APLCARE (800-275-2273)
Outside the USA—Contact Apple for support and service by phone
See a list of Apple phone numbers around the world.
https://support.apple.com/en-us/HT201232