QB Issue Resolution:

SOLVED: I have multiple locations on Square and the Sync app only works with one location at a time. I had to disconnect and reconnect to a new location for it to import other transactions.

Resolution for Issue 'QBO: Sync with Square does not import all transactions' available: Yes (Solved).
Source: Intuit Community forum.

QBO: Sync with Square does not import all transactions: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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