I'll share some information about printing a Debit Note. QuickBooks Online is unable to create a printable debit note. The process to create a debit note is through creating a journal, thus, printing it is unavailable.
As a workaround, you can print a Supplier Balance Detail Report. The report will post your vendor's information and debt obligations.
Here's how to get the report:
Go to Reports.
Select Supplier Balance Detail or Supplier Balance Summary.
Press Customise and filter to only show the supplier.
Tap Run report.
Click the Printer icon to print.
Refer to this guide for details about customising reports.