Hi Chandrasekhar,
It appears that you are either your own script or our
supplied sample to call the Delphix Engine's APIs.
The "requested resource is not available" error suggests that the Delphix Engine was unable to find the branch that you specified as a parameter.
The expected format of the Jet Stream Branch ID for our sample scripts is in the format JS_BRANCH-XX - for example, JS_BRANCH-41. You can find this branch ID using the CLI or API.
Please let me know if this helps.