QB Issue Resolution:

Since this is still happening even after trying out the steps I’ve provided, I suggest giving our Customer Care Team a call for further assistance. They have tools like screen-sharing that can help double check why the invoices showing the Print or save instead of the Review or pay button.

Here’s how to reach them:
1.    Go to https://help.quickbooks.intuit.com/en_US/contact.
2.    Select a topic twice.
3.    Scroll down and click the green Get Phone Number button to get their contact information.

Resolution for Issue 'Email invoice button says “Print or save” instead of “Review or pay”' available: Yes (Solved).
Source: Intuit Community forum.

Email invoice button says “Print or save” instead of “Review or pay”: 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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