[REG 5.15] Centrify login page does not work: The user agent does not support public key credentials.

When https://google.my.centrify.com/my is opened with a Qt 5.14 simplebrowser, the page is displayed correctly. When doing the same with Qt 5.15, only a blank page is displayed, and "Uncaught (in promise) NotSupportedError: The user agent does not support public key credentials." is displayed in the devtools.