error: 'allow-update' is not allowed in 'slave' zone

[trgapp16]

Hello,

I configured Bind 9.18.12 as slave DDNS with dynamic updates from DHCP (ISC DHCP 4.4) 
running on the same server (Ubuntu 22.04 server)

When I run "named-checkconf named.conf", I get the following error

"named.conf:2018: option 'allow-update' is not allowed in 'slave' zone 'zonename.com'"

Following is the named.conf file (part)

zone "zonename.com" {
type slave;
file "com/zonename/sec.zonename.com";
masters {
IP address;
};
allow-update {
key rndc-key;
};
allow-transfer {
IP address;
};
};

I am clueless what is going wrong. Any help is greatly appreciated

Thanks in advance,
Mounika

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