l2tp vpn problem

Hello,
I setup a vpn on my mikrotik l2tp/IPsec prekey
it’s work fine without any problem on my android device
when I tried to enable always on vpn it’s not working.
so where is the problem ?
thanks.

What is “always on vpn”?

the option under vpn in android that make the connection always on.
thanks.

deleted

I think the problem is in l2tp/ipsec client in your cell phone.
Or put here logs from Tik, when connection fails.