RESP=16 and RESP2=45 executing EXEC CICS WEB CONVERSE command

Question

Why am I getting RESP=16 and RESP2=45 when executing an EXEC CICS WEB CONVERSE command? I am doing an EXEC CICS TRANSFORM DATATOJSON to create a JSON structure. When I attempt to do the WEB CONVERSE I am not getting a code page conversion.

The CONVERSE command follows:

 EXEC CICS WEB CONVERSE POST
           URIMAP       (WS-URIMAP-NAME)
           CHANNEL      (OLB-CHANNEL)
           CONTAINER    (API-CONTAINER-TRANS)
           INTO         (WS-LARGE-AREA)
           TOLENGTH     (WS-LARGE-LENGTH)
           MEDIATYPE    (WS-MEDIA-TYPE)
           CLIENTCONV   (WS-CLICONVERT)
           CHARACTERSET (WS-CHAR-2)
           BODYCHARSET  (WS-BODYCHAR)
           STATUSCODE   (WS-STATUS-CODE)
           STATUSTEXT   (WS-STATUS-TEXT)
           STATUSLEN    (WS-STATUS-LENGTH)
           RESP         (WS-EIBRESP)
           RESP2        (WS-EIBRESP2)
           SESSTOKEN    (WS-SESSION-TOKEN)
 END-EXEC.

Our media type is defined as 56 bytes:

 03 WS-MEDIA-TYPE.
    05 FILLER                    PIC X(39)
       VALUE 'xxxxxxx/xxx.xxxxxxx.xxxxx-v1.0+json'.

Our characterset is defined as 40 bytes:

 03 WS-CHAR-2                    PIC X(05) VALUE
    'UTF-8'.

From our testing application/json as a media type generates the proper UTF-8 code page conversion.