Fortnite Mobile Internet Lag / VPN error message?

As you can see in the title, I have the problem that I'm kicked out of the group after about 30 seconds with the error message that my Internet is delayed or that I should please turn off the VPN. Someone like to tell me how to fix it.

PS: I downloaded a Fortnite Mobile IPA and installed it via sideloadly.

Have you tried without a VPN?

Yes, I've already tried or I didn't even have nh VPN

It should be the ping, and did you choose the next server?

I set the region to Europe and my ping is in the range of 15-25

I meant in terms of the VPN server.

As I said, I have not installed a VPN service

Just gamble near the router.