Error returned in processing transaction

Request

<?xml version="1.0" encoding="UTF-8"?>
<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ns1="http://fedex.com/ws/track/v8"><SOAP-ENV:Body><ns1:TrackRequest><ns1:WebAuthenticationDetail><ns1:UserCredential><ns1:Key>EVUW6x1liuTHNbPX</ns1:Key><ns1:Password>VwfVb3irFjEvlVcCabV6rrTSr</ns1:Password></ns1:UserCredential></ns1:WebAuthenticationDetail><ns1:ClientDetail><ns1:AccountNumber>510087240</ns1:AccountNumber><ns1:MeterNumber>100174045</ns1:MeterNumber></ns1:ClientDetail><ns1:TransactionDetail><ns1:CustomerTransactionId>*** Track Request v8 using PHP ***</ns1:CustomerTransactionId></ns1:TransactionDetail><ns1:Version><ns1:ServiceId>trck</ns1:ServiceId><ns1:Major>8</ns1:Major><ns1:Intermediate>0</ns1:Intermediate><ns1:Minor>0</ns1:Minor></ns1:Version><ns1:SelectionDetails><ns1:CarrierCode>FDXE</ns1:CarrierCode><ns1:PackageIdentifier><ns1:Type>TRACKING_NUMBER_OR_DOORTAG</ns1:Type><ns1:Value/></ns1:PackageIdentifier></ns1:SelectionDetails></ns1:TrackRequest></SOAP-ENV:Body></SOAP-ENV:Envelope>

Response

<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/"><SOAP-ENV:Header/><SOAP-ENV:Body><v8:TrackReply xmlns:v8="http://fedex.com/ws/track/v8"> <v8:HighestSeverity xmlns:v8="http://fedex.com/ws/track/v8">ERROR</v8:HighestSeverity>  <v8:Notifications xmlns:v8="http://fedex.com/ws/track/v8">     <v8:Severity xmlns:v8="http://fedex.com/ws/track/v8">ERROR</v8:Severity>     <v8:Source xmlns:v8="http://fedex.com/ws/track/v8">prof</v8:Source>     <v8:Code xmlns:v8="http://fedex.com/ws/track/v8">1000</v8:Code>     <v8:Message xmlns:v8="http://fedex.com/ws/track/v8">Authentication Failed</v8:Message>  </v8:Notifications> <v8:TransactionDetail xmlns:v8="http://fedex.com/ws/track/v8"><v8:CustomerTransactionId xmlns:v8="http://fedex.com/ws/track/v8">*** Track Request v8 using PHP ***</v8:CustomerTransactionId> </v8:TransactionDetail>  <v8:Version xmlns:v8="http://fedex.com/ws/track/v8">     <v8:ServiceId xmlns:v8="http://fedex.com/ws/track/v8">trck</v8:ServiceId>     <v8:Major xmlns:v8="http://fedex.com/ws/track/v8">8</v8:Major>     <v8:Intermediate xmlns:v8="http://fedex.com/ws/track/v8">0</v8:Intermediate>     <v8:Minor xmlns:v8="http://fedex.com/ws/track/v8">0</v8:Minor>  </v8:Version> </v8:TrackReply></SOAP-ENV:Body></SOAP-ENV:Envelope>