QB Issue Resolution:

There are size limitations to attachments and quite possibly your company file exceeds those.

Save the AC locally, then use a program like Send Big Files (there are others) to transmit.

Or copy to a flash drive and hand deliver.

Long time ago I recall the accountant would get an email with a link and all they had to do was follow the link, log in, and download, same with their return file to you.

Resolution for Issue 'Client cannot send accountants copy via Intuit server or attached to email. File has been condensed to reduce size. Why is this happening?' available: Yes (Solved).
Source: Intuit Community forum.

Client cannot send accountants copy via Intuit server or attached to email. File has been condensed to reduce size. Why is this happening?: 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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