Definitions of third party notice
a document issued by the claimant or the defendant to bring a third party into a lawsuit
You have only 20 days to file a Dispute Note to this Third Party Notice.
a provision in an insurance policy that lets you name someone whom the insurance company will contact if your policy is about to end because you have not paid the premium (=an amount to be paid for an insurance policy)
Even if the policy did include a third party notice requirement at the time of certificate issuance, that policy condition could be altered days later.