Western Union only has about 25% coverage nationwide - there are a lot of facilities that they do not cover. You should contact your inmate's facility and see if they have an online option for you unless you want to go the old fashioned way, and send a money order through the mail.
https://www.inmateaid.com/ask-the-inmate/how-do-you-put-money-on-inmates-account-when-western-union-doesn-t-serve-this#answer
Accepted Answer Date Created: May 27,2016