GoodCloud S2S is not working(not able to reach devices) when the VPN client is enabled.
Also tried enabling VPN cascading, but no luck.

Device: Flint
Version: openwrt-ax1800-4.2.0-1229-1672293957.tar
VPN Client: OpenVPN
Services from GL.iNet Use VPN: Disabled

It is not recommended to use GoodCloud Site to Site and VPN Client at the same time, as they may conflict with each other.
GoodCloud Site to Site condition