IPFIRE Wiki Force clients to use IPFire's DNS proxy

When trying to setup the force all traffic to DNS I get the following error

“You have to select a single host for DNAT. Groups or networks are not allowed.”
But the Wiki is stating to use a Service Groups “DNS”

I am following the IpfireWiki https://wiki.ipfire.org/configuration/firewall/dns

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I am guessing you used Option 1 but that option has a bug.

You should use Option 2.

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You can even try the suggestions in Forcing all DNS traffic from the LAN to the firewall