Short answer is you can not get a where used report in QB.  The only way ot get the BOM within QB is to edit and print each assembly item one at a time

this utility does do what you want
I am not affiliated

Resolution for 'BOM within issue: 'Download Bill of Materials' available: Yes.

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

For more information about resolving issues related to BOM within in Quickbooks/QBO or to get support for the issue 'Download Bill of Materials', click the link below: