The following could be one of the reasons for the rejection of your health insurance portability request:
Delays in document submission.
Incomplete or incorrect information was submitted.
Periods of non-renewal or non-payment of premiums.
Having a bad claim history, especially if several health claims are filed in a short period of time.
There are significant changes between your current plan’s exclusions, inclusions, and other benefits and the new policy to which you want to move.
Previous policy documents were not submitted. As a result, make sure to save at least the last three years’ worth of policy documents.