Thanks for your interest in Zephyr.
It is mandatory both Zephyr for JIRA and ZAPI should be installed and running in your instance to get these API work.Please check and let us know if Zephyr for JIRA and ZAPI is working with a valid license.
Also kindly follow the link and sample code attached below for referring to your need of creating new test cycle and add existing test cases into it
For any further queries kindly sign up to "https://support.getzephyr.com/hc/en-us" and use the option "Submit a Case" to raise a ticket with us
Thanks & Regards
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