Certain urls are not blocked even though they are in the deny list

I’m attempting to block ads on Amazon Prime Video that is running on my LG WebOS TV, as a result I put in the deny list unagi-eu.amazon.com and unagi-na.amazon.com, however the url doesn’t get blocked and if I try with my iPad tied with NextDNS and same configuration of the smart TV the dns lookup occurs successfully. When I inspect the log the domains appears as solved correctly. This happens only with these two, the other blocking rules are working fine. How Possible is that.