Running XProtect Corporate 2019 R2. Authentication works, running and stopping live feeds works. GOTO, NEXT, PREVIOUS return empty ImageResponse messages, in response to a GOTO query given the current time in MS from epoche:
ImageResponse
RequestId: 9
Prev: 0
Current: 0
Next: 0
Content-length: 0
Content-type: application/x-genericbytedata-octet-stream