Login Failed (Unauthorized) using IOS 12.4

We getting authentication failed using last IOS version (12.4).
On logs we can see the user login and after (less than 1 second) the user make logout…
We are using 6.2.5 version( We tested using 6.3.2, but problem continue)
On all devices (Android) and IOS until 12.3 it’s Ok.
I had tested on all Grafana 6.x versions with authentication errors.
Testing Grafana 5.4.4 the authentication was sucessfully.
Someone get this problem?

Yes, same symptoms here. v6.3.2 (commit: 4832460).

t=2019-09-12T11:04:47+0000 lvl=info msg=“Successful Login” logger=http.server User=admin@localhost

t=2019-09-12T11:04:48+0000 lvl=info msg=“Request Completed” logger=context userId=0 orgId=0 uname= method=GET path=/api/dashboards/home status=401 remote_addr=x.x.x.x time_ms=0 size=26 referer=http://hostname:3000/

t=2019-09-12T11:04:48+0000 lvl=info msg=“Request Completed” logger=context userId=0 orgId=0 uname= method=GET path=/api/login/ping status=401 remote_addr=x.x.x.x time_ms=0 size=26 referer=http://hostname:3000/

t=2019-09-12T11:04:48+0000 lvl=info msg=“Successful Logout” logger=http.server User=admin@localhost

Note uname is blank in two of these log entries.

Login attempt was from iOS 12.4 with Safari on iPad. Logout was involuntary. Grafana displayed “Unauthorized” very briefly on iPad browser in red immediately after successful login.