"No Internet, secured" on Wi-Fi devices with static IPs when using Pi-Hole DHCP

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If Windows clients, check DNS server(s) assigned and DHCP service used with below one:

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

   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes
   IPv4 Address. . . . . . . . . . . : 10.0.0.11(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Lease Obtained. . . . . . . . . . : woensdag 28 augustus 2019 15:31:51
   Lease Expires . . . . . . . . . . : donderdag 29 augustus 2019 15:31:51
   Default Gateway . . . . . . . . . : 10.0.0.1
   DHCP Server . . . . . . . . . . . : 10.0.0.2
   DNS Servers . . . . . . . . . . . : 10.0.0.2
   NetBIOS over Tcpip. . . . . . . . : Enabled
[..]

And use the nslookup tool to test (runs on Windows/Linux/MacOS clients):

C:\>nslookup pi.hole 10.0.0.2
Server:  noads.dehakkelaar.nl
Address:  10.0.0.2

Name:    pi.hole
Address:  10.0.0.2

C:\>nslookup pi.hole 8.8.8.8
Server:  dns.google
Address:  8.8.8.8

*** dns.google can't find pi.hole: Non-existent domain

C:\>nslookup pi-hole.net
Server:  noads.dehakkelaar.nl
Address:  10.0.0.2

Non-authoritative answer:
Name:    pi-hole.net
Addresses:  2604:a880:400:d0::1071:1
          206.189.252.21

C:\>nslookup pi-hole.net 8.8.8.8
Server:  dns.google
Address:  8.8.8.8

Non-authoritative answer:
Name:    pi-hole.net
Addresses:  2604:a880:400:d0::1071:1
          206.189.252.21