I receive the same error code OL304 - I DID contact Amex. Spent half an hour verifying what I already knew - there have been no changes to my account with American Express. They stated this has been an ongoing issue and that it would require Quickbooks support to resolve the issue. They even stated there was a chat area specifically for this AMEX issue. I haven't found that, obviously. They first sent me to a Quicken chat link. What a cluster. In any case, this started three months ago. It worked perfectly for a year prior to the day it gave me the first error. Error also states it is "Temporary" ....what is the solution for this? I need this to work - it is a critical time-saver and I don't have time to manually enter a dozen business Amex cards total transactions! Thanks.