I would definitely ask the venue to change the tag on the photos they shared. If nothing else, just so someone who uses the pop up flash on their camera doesn’t get credit for my work.

If they delivered the photos to you with a completely washed out sky and background, chances are the raw images aren’t going to help you. Im guessing if the sky could have been recovered, they would have done it. That’s the thing about shooting portraits outdoors with only natural light.