The expected value 3030, in hex translates to "00" which is an approval. The actual value you received 3936 translates to "96", which is one of many possible decline codes.

8A is the tag identifier for (Authorisation Response Code). 02 is the length of the data in bytes, 3936 is the value (2 bytes is 4 hex digits). There is not enough information to tell if it is a host problem, issuer problem, or perhaps a problem with the transaction data that was sent to the host.

Your payment processor / host should be able to tell you what decline code 96 means.