You cannot use blank check stock you must use pre-printed checks. QB only prints the payee and amount.
Resolution for 'check paper issue: 'How to set up to printy checks on blank check paper' available: Yes.
The check paper 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 check paper issue yourself by looking for a resolution described in the article. If it is a complex check paper issue or you are unable to solve the issue, you may contact us by clicking here or by using other check paper support options.
For more information about resolving issues related to check paper in Quickbooks/QBO or to get support for the issue 'How to set up to printy checks on blank check paper', click the link below: