Can't open Links on Excel-export

We upgraded our Jira today and like things are going... u cant test everything...

If we make an excel-export of an filter, open the filter, the issues are linked correctly, that means, if i copy the issue link (like https://url/brwose/TEST-20) open that url in a browser, all works fine.

BUT if i'm clicking in excel on that hyperlink i get an error message (see Screenshot)
Screen is in german, translated its like: URL/browse/TEST-20 could not be opened. The requested information could not be downloaded.

With Jira 3.13.4 it worked...