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I have gone through the wizard already. 

I followed this guide: https://homenetworkguy.com/how-to/beginners-guide-to-set-up-home-network-using-opnsense/.  That should tell you what my DNS settings are. 

No, opnsense box has replaced the pfsense device.  I switch between the devices until I can get this working.

I pinged 9.9.9.9 from my phone, connected to a cell tower, to confirm that it responds to ping.  That was not a client on my network.
I get no response.  But when I do packet capture, I see echo replies.
Client computers can not access the internet.  My opnsense box also has issues (ie checking for updates, fails).  Something like name resolution.
My box is an old desktop.
It is a placeholder for my current pfsense box.  I didn't wanna wipe my pfsense box till I was 100% sure I got the config right, and secured.
I will post the firewall rules for lan and wan.
https://ibb.co/kMfYcs5
https://ibb.co/rMMqzhR

Internet -> Modem -> opnsense box -> switch -> end client machine.

I'm not sure what else to describe.  I think ping is one of the most basic tests.  If I can't get out/ping, then it's not worth it to go any further.

I've been using pfsense up until now.  I would say I'm pretty knowledgeable, including dhcp, dns, and ports, as well as firewall rules. 
Yes, this is a residential setup.
Let me know if there are any other screenshots of settings you'd like to see. 

I am able to confirm that 9.9.9.9 does respond to ping from a working computer.
Please define "working setup"?  I am not actively using it, because the clients have no connectivity, but that's another issue, and I want to be able to resolve the issue with the OPNSense device not able to connect out onto the internet.

From the device, I attempt to ping the ISP GW as well as a public DNS server's IP. 

I deployed the latest version of OPNSense to a box.  It is a simple setup so far.  There is a wan and a lan.  The WAN was able to pull a public IP address.  But from the OPNSense box, ping does not seem to work.  I attempt to ping in the web ui and in the terminal, and it fails.  When I look in the packet capture, I see a echo reply.  I've attached my WAN firewall rules. 
https://ibb.co/sgSwZc1