Worked with TAC on 10.1.5 h2 the workaround provided below (using Chrome):
--> Navigated to Monitor->WildfireSubmissions->WildfireAnalysis Report
--> Right-click on it and select view frame source.
--> Remove the view-source from the URL
>> After completing the above workaround, we would be able to generate the report.
PAN-183826 was added to PAN-OS 9.1.14 release note.
PAN-183826 - "Fixed an issue where, after clicking WildFire Analysis Report, the web interface failed to display the report with the following error message: refused to connect."
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