dns integration saying plugin does not match requirements

When trying to use the dns extension in Neutron server I get the following error:

2023-08-28 13:07:58.238 1585275 ERROR neutron.api.extensions [None req-8c90ab6f-0c86-41ae-bec0-188ec8a22994 - - - - - -] Unable to process extensions (dns-domain-ports, dns-integration, auto-allocated-topology) because the configured plugins do not satisfy their requirements. Some features will not work as expected.
2023-08-28 13:07:58.239 1585275 ERROR neutron.service [None req-8c90ab6f-0c86-41ae-bec0-188ec8a22994 - - - - - -] Unrecoverable error: please check log for details.: neutron_lib.exceptions.ExtensionsNotFound: Extensions not found: ['dns-domain-ports', 'dns-integration', 'auto-allocated-topology'].
2023-08-28 13:07:58.239 1585275 ERROR neutron.service neutron_lib.exceptions.ExtensionsNotFound: Extensions not found: ['dns-domain-ports', 'dns-integration', 'auto-allocated-topology'].
2023-08-28 13:07:58.240 1585275 CRITICAL neutron [None req-8c90ab6f-0c86-41ae-bec0-188ec8a22994 - - - - - -] Unhandled error: neutron_lib.exceptions.ExtensionsNotFound: Extensions not found: ['dns-domain-ports', 'dns-integration', 'auto-allocated-topology'].

The extension was added to /etc/neutron/plugins/ml2/ml2_conf.ini as follows:

[ml2]

# An ordered list of extension driver entrypoints to be loaded from the
# neutron.ml2.extension_drivers namespace. For example: extension_drivers =
# port_security,qos (list value)
extension_drivers = port_security,dns

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: neutron-server 2:22.0.1-0ubuntu1~cloud0 [origin: Canonical]
ProcVersionSignature: Ubuntu 5.15.0-78.85-generic 5.15.99
Uname: Linux 5.15.0-78-generic x86_64
ApportVersion: 2.20.11-0ubuntu82.5
Architecture: amd64
CasperMD5CheckResult: unknown
CloudArchitecture: x86_64
CloudID: maas
CloudName: maas
CloudPlatform: maas
CloudSubPlatform: seed-dir (http://172.16.9.2:5248/MAAS/metadata/)
CrashDB:
 {
                "impl": "launchpad",
                "project": "cloud-archive",
                "bug_pattern_url": "http://people.canonical.com/~ubuntu-archive/bugpatterns/bugpatterns.xml",
             }
Date: Mon Aug 28 14:55:03 2023
PackageArchitecture: all
RebootRequiredPkgs: Error: path contained symlinks.
SourcePackage: neutron
UpgradeStatus: No upgrade log present (probably fresh install)
---
ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu82.5
Architecture: amd64
CasperMD5CheckResult: unknown
CloudArchitecture: x86_64
CloudID: maas
CloudName: maas
CloudPlatform: maas
CloudSubPlatform: seed-dir (http://172.16.9.2:5248/MAAS/metadata/)
CrashDB:
 {
                "impl": "launchpad",
                "project": "cloud-archive",
                "bug_pattern_url": "http://people.canonical.com/~ubuntu-archive/bugpatterns/bugpatterns.xml",
             }
DistroRelease: Ubuntu 22.04
Package: designate 1:16.0.0-0ubuntu1~cloud0 [origin: Canonical]
PackageArchitecture: all
ProcVersionSignature: Ubuntu 5.15.0-78.85-generic 5.15.99
RebootRequiredPkgs: Error: path contained symlinks.
Tags: jammy uec-images third-party-packages
Uname: Linux 5.15.0-78-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: N/A
_MarkForUpload: True