QB Issue Resolution:

Go to Edit menu > Preferences, General, My Preferences, and checkmark Bring Back All One Time Messages. Someone likely dismissed it by selecting Do Not Show Again.

Resolution for Issue 'when recording invoices available credits does not pop up any more.Would like this function back.' available: Yes (Solved).
Source: Intuit Community forum.

when recording invoices available credits does not pop up any more.Would like this function back.: 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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