Could you help me with how you are actually initiating the transfer? The app and other online info are saying that Western Union is not currently available. Are you using the app connected to a US or other foreign account?
I've done it the same way every time, through the app with an account from the UK. Prior to maybe 2 months ago I was unable to initiate a transfer to a bank account, only to a cash pick-up. Since they've started to allow them, I haven't had any issues actually sending the money, only in the final step of the money being delivered to the requested account. Is your account from another country? Are able to send to cash or is nothing working for you?