A policyowner's rights are limited under which beneficiary designation?

The answer is "irrevocable".

When you applied for the insurance, you may have made the beneficiary designation irrevocable, this implies the beneficiary can't be changed without the assent of that same beneficiary. The approach itself will show regardless of whether a beneficiary is irrevocable. While this course of action is in some cases attractive for domain arranging purposes, the lawful status of an irrevocable recipient isn't clear. Some may consider an irrevocable recipient as a co-proprietor of the approach; accordingly, the beneficiary's agree is expected to practice any arrangement rights.