QB Issue Resolution:

the button will not activate until you have the check payment on screen

bring up receive payments and use the previous button to cycle back to the payment

be aware that when you use the bounced check button, QB will mark the invoice unpaid

which is wrong in my opinion, and if the payment is in a closed period you will have to open that closed period first

Resolution for Issue 'Customer nsf: bounced check icon is greyed out.' available: Yes (Solved).
Source: Intuit Community forum.

Customer nsf: bounced check icon is greyed out.: 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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