Few suggestions:
Check the RAW tab in SOAP UI to check the request headers like (Content-type , content -length etc..) So set the same content type in your channel using MTB.
Moduel: Message TransformBean
Parameter :Transform.ContentType
Parameter-Value : <Content-type which you see in RAW tab of the request in soap U eg:text/xml;utf-8>
In XMLAnonymizerbean the namespace http://schemas.xmlsoap.org/soap/envelope
is missing '/' add this in your module it should be http://schemas.xmlsoap.org/soap/envelope/
Execute and cross the payload in messageloggerbean with the soap UI request , both should match exactly.
Br,
Manoj