@Vinny74 just install openvpn-auth-ldap.x86_64 from Epel repo
modify files below :
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/etc/openvpnhost-to-net.conf
plugin /usr/lib64/openvpn/plugin/lib/openvpn-auth-ldap.so “/etc/openvpn/auth/ldap.conf”
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/etc/openvpn/auth/ldap.conf
URL ldap://example.local
BindDN CN=openvpn,CN=Users,DC=example,DC=local
Password openvpn
Timeout 15
TLSEnable no
BaseDN "DC=example,DC=local"
SearchFilter “(&(sAMAccountName=%u)(memberOf=CN=VPN users,CN=Users,DC=example,DC=local))”
In AD in Users create user openvpn with password openvpn. Create group of users “VPN users”