Hi Sandra,
your configuration looks correct.
in your sender channel , you have defined resource endpoint as "ConsultasOTI", whereas when you are testing using REST client your URL points to resource "ConsultasOTI2"
do you have 2 different resources, can you share the screenshot of "REST Resources" tab for channel configured to resource "ConsultasOTI2"
check if channel with "ConsultasOTI2" endpoint has correct configuration in "REST Resources"