Router not resolving pi-hole hostname

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Not sure if will fix but find out your DNS suffix on the router:

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With your Win10 PC you can figure out suffix with ipconfig:

C:\>ipconfig /all
[..]
Ethernet adapter Local Area Connection:

   Connection-specific DNS Suffix  . : dehakkelaar.nl
[..]

EDIT: Oops sorry, was confusing this thread with another ... if the client is a Mac, hostname -f should display the full name including suffix.

And change the hostname on the Pi-hole box accordingly including the suffix:

pi@noads:~ $ hostname -f
noads

pi@noads:~ $ sudo hostnamectl set-hostname noads.dehakkelaar.nl
pi@noads:~ $

pi@noads:~ $ hostname -f
noads.dehakkelaar.nl

EDIT2: one more when changing hostname on Pihole, also make sure its reflected in below file:

pi@noads:~ $ cat /etc/hosts
[..]
127.0.1.1       noads.dehakkelaar.nl
[..]

You also might need to run below and select repair to let Pi-hole know of the change:

pihole -r

Below some links I DuckDucked explaining the trailing dot:

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