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Expected Behaviour:
[After initial set up of pi hole has been successfully completed, Ads should be blocked after configuring my DNS server to 192.168.1.73 (The IP address of my Pi Hole) on my LAN IP Settings (not WAN) after flushing my DNS and restarting my router as well.]
Actual Behaviour:
[0 queries have been blocked by Pi Hole. Tested on several devices. ]
This device is not using Pi-Hole as DNS server. It is using an IPV6 DNS that appears to be from your ISP. I would disable IPv6 on your router and renew the lease on the client.