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The problem is, that you need to use the DNS-server you get back from ExpressVPN. You can check that on your tablet or PC, when you are connected to an Express VPN server.
In OpnSense you can derive the DNS server from the Virtual.Addr. you find in VPN.OpenVPN.Connectionstatus. e.g. your virtual address ist: 10.12.12.103 then your gateway and DNS server is: 10.12.12.1
But be aware, that your IP address may change if you reconnect.