fix 7646

Riot/Modules/Settings/Security/ManageSession/ManageSessionViewController.m

@@ -655,6 +655,20 @@ enum {
 }
 
 - (void)removeDevice
+{
+    NSURL *logoutURL = [self.mainSession.homeserverWellknown.authentication getMasLogoutDeviceURLFromDeviceID:device.deviceId];
+    if (logoutURL)
+    {
+        [UIApplication.sharedApplication openURL:logoutURL options:@{} completionHandler:nil];
+        [self withdrawViewControllerAnimated:YES completion:nil];
+    }
+    else
+    {
+        [self removeDeviceThroughAPI];
+    }
+}
+
+-(void) removeDeviceThroughAPI
 {
     [self startActivityIndicator];
     self.view.userInteractionEnabled = NO;