There is a limitation as to how many changes the accountant’s copy will allow.  It doesn’t like more than 200 changes.  So you have to do them in stages.  Not sure if that is your issue.  And yes, I found that out the hard way.  Also try this page: 

Resolution for 'client resolve issue: 'client pdf file of accountant changes does not “complete” How can the client resolve this?' available: Yes.

The client resolve 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 client resolve issue yourself by looking for a resolution described in the article. If it is a complex client resolve issue or you are unable to solve the issue, you may contact us by clicking here or by using other client resolve support options.

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