Effective March 31, 2023, Citrix changes its licensing policy and customers are required to update to the latest version of the Citrix License Server and continue regular updates of license server software within six months of new license server releases. Deploying the new license server is straightforward and designed to not impact production or non-production systems.
You can find the support article about this here: https://support.citrix.com/article/CTX477636/required-license-server-update.
There is also an FAQ about the article: https://support.citrix.com/article/CTX477614/citrix-license-telemetry-faq.
Please contact us for further information as your Citrix Gold Solution Advisor.