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Find practical ways to fix problems when QuickBooks and American Express don't sync. Common issues covered in this guide include obsolete software, expired authentication tokens, and erroneous login credentials. Discover how to resolve issues step-by-step, such as reestablishing accounts, manually uploading transactions, upgrading QuickBooks, and cleaning the cache on your browser. Additionally, it highlights best practicesu2014like frequent updates, prompt reauthorizations, and monthly reconciliationsu2014to avoid future sync issues.
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