In preferences set reminders to show over due invoices, then set preferences to open reminders when opening the file
Resolution for 'Alert issue: 'Alert Invoice is due' available: Yes.
The Alert 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 Alert issue yourself by looking for a resolution described in the article. If it is a complex Alert issue or you are unable to solve the issue, you may contact us by clicking here or by using other Alert support options.
For more information about resolving issues related to Alert in Quickbooks/QBO or to get support for the issue 'Alert Invoice is due', click the link below: