VPN can only 1 user connect at same time

RouterOS General
1

I have set some vpn users but can only 1 user connect at same time, if other user login, there existing user will be connected.

And those users PC are in same network.

How can fix it?

2

What device is your server running on? What RouterOS license do you have ?

3

I m using RB750Gr2 with RouterOS v6.37.3