if you are running open vpn access server in docker then follow the below command to reset the admin password 


docker exec -it openvpn-as \ /usr/local/openvpn_as/scripts/sacli --user openvpn --new_pass "YourPassWord@123" SetLocalPassword

Then restart the service (or the container):

docker restart openvpn-as

here

openvpn-as

is my docker container name you can change according to your need