Always screenshot the error message. The exact timestamp and transaction reference (if any) can reduce your call with Western Union support from 30 minutes to under 5.
Have you resolved a U0407 error using this guide? Share your experience below, and help others decode their Western Union issues faster. u0407 western union code
"I got U0407 five times. Then I realized I was entering my receiver's phone number with a '1' prefix. Removed the '1' and it worked instantly." Always screenshot the error message