I have submitted this feedback to Apple. ( https://www.apple.com/feedback/?aid=CA-link )
I purchased the blue black/mango band seen here (left most watch):
The color choice for Mango/Blue Black appears to be missing from the Apple Watch watch face app for Nike watches.
I'm using that watch face seen above, but the Mango color is not there. I see Pure Platinum, Volt etc etc. The closest color option is Total Orange, but it definitely does not match the Mango color. I'm hoping this can be added quickly??
Apple Watch Nike Series 6 GPS + Cellular, 44mm Space Gray Aluminum Case with Blue Black/Bright Mango Nike Sport Band
I purchased the blue black/mango band seen here (left most watch):

Apple Watch Nike
Apple and Nike have taken our long-running partnership even further with bands designed to minimize waste and reduce our impact on the environment.
www.apple.com
The color choice for Mango/Blue Black appears to be missing from the Apple Watch watch face app for Nike watches.
I'm using that watch face seen above, but the Mango color is not there. I see Pure Platinum, Volt etc etc. The closest color option is Total Orange, but it definitely does not match the Mango color. I'm hoping this can be added quickly??
Apple Watch Nike Series 6 GPS + Cellular, 44mm Space Gray Aluminum Case with Blue Black/Bright Mango Nike Sport Band