@selfhosted strange problem. I have a raspberrypi as vpn gateway. I have a reolink cctv. It emails me when motion. If i use openvpn, it works fine. If i use wireguard, it does not work. If i connect to the vpn gateway on my laptop, openvpn and wg forward the laptop traffic fine. The openvpn and wg is connects to the same commerical vpn service.
Try taking pieces out until you narrow down the issue.
IE: bring a WG tunnel up direct between your phone and home without the commercial VPN. Keep adding layers back in until something breaks.