No download possible when connected to VPN

[TschickTschack]

Hello all,

I'm using a private L2TP/IPSec VPN server (located at my home) when connecting my Windows 10 Phone (Lumia930) to public WLANs to secure communication. If the phone is connected this way, it is not possible to start downloading songs for offline use. Settings - Ofline/Sync shows a message like "WLAN-Conneciton available but Spotifiy is currently using VPN. It is not possible to sync on VPN with your current sync settings.".

If VPN connection is built up when a download is already running via WLAN, the download is running without problems.

Is there any possibility to fix this issue or where can I change the sync options to allow VPN usage?

Thank you