QB Issue Resolution:

Yes, you can send an invoice late payment to your customers.

Go to Transactions (left panel) > choose Sales > click Overdue > select the Invoice you would like to send > on the Action column, choose Send from the drop-down.

To check if the customer viewed or opened up the invoice, go to Transactions (left panel) > choose Sales > click  Open Invoices > on the Status column, it will be displayed either it is Viewed or Opened.

Resolution for Issue 'Can quickbooks online send invoice late payment reminders to clients? Also can you view if a client has opened an estimate or invoice?' available: Yes (Solved).
Source: Intuit Community forum.

Can quickbooks online send invoice late payment reminders to clients? Also can you view if a client has opened an estimate or invoice?: 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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