Per ICANN rules as of December 1, 2016, changing any of the registrant data on a domain name should automatically enter the domain into a 60-day transfer lock. Users do, however, have the option to opt-out of this lock prior to changing the registrant data. eNom support this process through their API.
Please add support for allowing users to opt-out of the 60-day lock within WHMCS so they can update their registrant contact info without being subjected to the lock.
Relevant links: https://www.icann.org/resources/pages/ownership-2013-05-03-eneNom
Thanks for your suggestion. We have been working with our registrar partners at eNom and ResellerClub to implement this necessary (but unsexy) feature. I'm pleased to advise is has now been implemented in version 7.6 - currently undergoing beta testing:
Feature Spotlight Blog
Please help us test, and share your thoughts and experiences with this feature in particular in this dedicated thread: Domain Verification - Share Your Experiences