Why can't employee change life insurance increase enrollment back to Waive?

Summary:

Employee elected to increase employee life, and submitted elections. Interim coverage was triggered and pending action item is created requesting proof of good health. Employee decided they don't want to increase, so they unenroll the increase amount, and try to save. Interim coverage is the Waive plan. When submitting the election change, the system is saying they are not enrolled in any plans because the interim/suspended coverage is the waive plan. Why can't the employee save the enrollment?

Content (please ensure you mask any confidential information):

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):