The HP/HPE re-enrollment rules are based on a fundamental principle of health insurance -- everyone continuously pays into the overall health insurance system pool when they are healthy. (For example, if you don't sign up for each of the various Medicare elements when first eligible, you pay a late enrollment penalty for years.) 

If you have such a change, contact your Benefits Center ASAP -- or contact the insurance sales agency that you bought the plan from, such as Alight Retiree Health Solutions (formerly Aon Retiree Health Exchange) Alight Retiree Health Solutions contacts  "They couldn't do the surgery because his insurance had been terminated. It took a very long three-way phone call with the Benefits Center and [the carrier] to get his new coverage entered into the system."

See your Enrollment Guide. Re-enrollment rules are in a table on page 14.

- HPE's "Former Employee" site is public: https://hr.ext.hpe.com/External-HR-Support-USA.  Note: Loads very slowly. Click "COUNTRY SPECIFIC LINKS.")

- HPE 2023 Enrollment Guide posted publicly here: https://myhperewards.com/pdf/hpe-retiree-guide-2023.pdf  Cover: Couple at amusement park. Kissing a stuffed penguin.)
We have a copy: https://www.hpalumni.org/hpe-retiree-guide-2023.pdf  File created 10/20/22. Downloaded by HPAA Nov 6.