"NOTE OpenWhisk is updating it's authentication model. Users must update to the new authentication model in which each namespace now has a unique authentication key associated with it
NOTE This key will change as you switch namespaces in Bluemix so you must rerun this command if you switch your Bluemix organization or space
from https://console.ng.bluemix.net/openwhisk/cli
"NOTE OpenWhisk is updating it's authentication model. Users must update to the new authentication model in which each namespace now has a unique authentication key associated with it
NOTE This key will change as you switch namespaces in Bluemix so you must rerun this command if you switch your Bluemix organization or space
and
https://www.ibm.com/blogs/bluemix/2016/12/openwhisk-api-keys-update/