Failed Silent Login for iPhone Users


we are having troubles logging iPhone Users in the first time after they were inactive for a while.
They are producing “Failed Silent Login” multiple times in the logs, and not just once.
It happens that they produce this log line up to 10 times until they are logged in finally. Which means they get redirected up to 10 times to the login screen.

We are using Auth0 with Spring Boot and Angular (auth0-angular v1.9.0) accordingly to the Github Auth0 documentation.

Anybody any idea to find the root cause?