If you are using openvpn-as (docker), you have to login in admin web-interface https://IP:943/admin - User Managment - User permissions, select an account, that has to be connected to local network. Then More settings (icon with a pencil), Access control:
Allow Access To these Networks: subnet IP/mask (e.g. 10.0.0.0/16)
For sure turn in option 'all server-side private subnets'
Save settings + update running server.