Problem
You have configured a DHCP Subnet with a range to dynamically assign IP addresses to devices but some devices / all within the range won’t get an IP address.
Environment
Beside your DHCP Subnet you also have configured a Pool, probably matching the Subnet Range.
Solution
Subnet Ranges are obsolete and superseded by the DHCP Pool. Remove the Range within your Subnet and use a Pool instead. Ranges had less functionality compared to a DHCP Pool.