Someone answered my same question. This is what they said to do. And it worked!

  1. Click on Customers at the top menu bar.
  2. Select on Create Invoices.
  3. Open an existing invoice.
  4. Put a check mark on the Email Later option from the Main menu of the page.
  5. Click on Save and Close.
  6. From the Company menu, select on Reminders.
  7. Under Business Service […]

Resolution for 'Business Service Messages issue: '“You have forms to send” in reminders list won’t go away.' available: Yes.

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

For more information about resolving issues related to Business Service Messages in Quickbooks/QBO or to get support for the issue '“You have forms to send” in reminders list won’t go away.', click the link below: