How to troubleshoot DNS not resolved issues?

Question

I can't open Hotstar/Disney+ on my Android phone/ Android TV. Upon investigation, I found out that the webpage hotstar.com is not opening in general on my phone/TV and is throwing an "err::NAME NOT RESOLVED" error. I can open hotstar.com on my laptop using the same network. Since this problem just started abruptly, I don't even know where to look for. Thanks for any suggestions you may provide.

Start with dig. See my answers to How does Android OS do DNS name resolution? and How to configure DNS on Android? and How to clear DNS cache on Android? — Irfan Latif, Apr 16 '21 at 20:34
I did some more investigations and it turns out my ISP is probably spoofing my DNS queries. It works fine if I use a VPN or a private DNS(on my phone, dns.google) or an encrypted DNS (using the app blokada). However, using those is really cumbersome on a frigging TV and I had to sideload those apps. It also shows non-existent domain on nslookup on my desktop. I did factory resets on my TV, it didn't help. I may try changing the DNS manually if I can figure out how to connect to my TV in debugger mode. I can't set up a static ip for my devices either so far. — Rajat Mondal, Apr 16 '21 at 21:00

How to troubleshoot DNS not resolved issues?

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