Devices connected to my Deco router should be able to access the internet.
DNS settings on the devices are changed but no internet connection is displayed
Your debug log shows that you are not distributing Pi-hole as local DNS server:
*** [ DIAGNOSING ]: Discovering active DHCP servers (takes 10 seconds)
Scanning all your interfaces for DHCP servers
* Received 300 bytes from wlan0:192.168.68.1
DHCP options:
Message type: DHCPOFFER (2)
router: 192.168.68.1
dns-server: 8.8.8.8
--- end of options ---
If that's not a temporary precaution, then note that your clients would completely by-pass your Pi-hole via 8.8.8.8.
Your debug log also shows your Pi-hole to be fully operational, receiving, answering and blocking queries as expected:
*** [ DIAGNOSING ]: Name resolution (IPv4) using a random blocked domain and a known ad-serving domain
[✓] ns.usvision.administrator.productions.net.zooplus.it is 0.0.0.0 on lo (127.0.0.1)
[✓] ns.usvision.administrator.productions.net.zooplus.it is 0.0.0.0 on eth0 (192.168.68.124)
[✓] ns.usvision.administrator.productions.net.zooplus.it is 0.0.0.0 on wlan0 (192.168.68.124)
[✓] doubleclick.com is 172.217.24.110 via a remote, public DNS server (8.8.8.8)
However, it would seem that you have assigned the very same IP address to both of your RPi's network interfaces.
This may cause routing issues: Your router may direct your client's DNS requests to your RPI's inactive eth0 interface, where Pi-hole never receives them.
Each NIC should have its own distinct IP address.
Thanks for checking. I generated a new log to reflect the DNS change on my router. Its now pointing to 192.168.68.124. Also changed the ip address of eth0 but still getting the same issue. Should I change anything on my router itself aside from the DNS change?
Below is the complete log
eth0 (192.168.68.200)
After you changed the IP of the interface, did you run pihole -r and reconfigure Pi-hole to this new IP?
Why do you have two active interfaces on the Pi? Your post indicates " Pi-hole configured on Raspberry pi and connected via wireless lan", but you have Pi-hole configured for ethernet.
If you don't need to have two interfaces active, disable WiFi on the Pi and just use the ethernet interface.
Yes I did run reconfigure. I have connected my Pi via Wi-Fi. Would it be best if I use eth0 instead?
You appear to have connected the Pi by both ethernet and WiFi. If this is the case, ethernet is your preferred option for a DNS server.
That did it. Disabled eth0 interface instead as I wanted to use wifi and it worked! Thanks a lot 
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