Code
[provider_wireguard]
Type = WireGuard
Name = AirVPN
Host = 213.152.162.12
WireGuard.Address = 10.173.72.95/32
WireGuard.ListenPort = 1637
WireGuard.PrivateKey = REDACTED
WireGuard.PublicKey = REDACTED
WireGuard.PresharedKey = REDACTED
WireGuard.DNS = 10.128.0.1
WireGuard.AllowedIPs = 0.0.0.0/0
WireGuard.EndpointPort = 1637
WireGuard.PersistentKeepalive = 15
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See if this ^ works. Host is the WireGuard server that you connect to, so you need to resolve nl3.vpn.airdns.org to an IP (not possible to use an FQDN with ConnMan) and WireGuard.Address is the IP allocated to you, and since you are not connecting to access an internal subnet I'm making an educated guess that this should be /32 not /24.