QB Issue Resolution:

if you are within the first 60 days of starting the account, see this to completely purge the file and start over
https://qboe.custhelp.com/app/answers/detail/a_id/5984/related/1

then export desktop to QBO

QBDT to QBO limitations
https://qboe.custhelp.com/app/answers/detail/a_id/4095

how to go from QBDT to QBO
https://qboe.custhelp.com/app/answers/detail/a_id/4777/related/1

Resolution for Issue 'Book keepers and acct have been working on the desktop version it is now sanitized can i re upload to the online with out duplication.' available: Yes (Solved).
Source: Intuit Community forum.

Book keepers and acct have been working on the desktop version it is now sanitized can i re upload to the online with out duplication.: 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.

Support for Desktop
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