Can't seem to port forward port 53

Hi there everyone, this might be the wrong question for this server, but I'm struggling to forward port 53 for my DNS server.

I've set up port 53 on both "Virtual Servers" and "Port Triggering" in my tp-link router.
I've ran some tests on the DNS server and it works perfectly fine.
Could this be my ISP blocking port 53?
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