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1.Export namespace status file to your directory as json file.
$ microk8s.kubectl get namespace ${YOUR_NAMESPACE} -o json > tmp.json
2. Edit the tmp.json file, and remove “kubernetes” that is set on “finalizers” key.
3. launch proxy server using below command
$ microk8s.kubectl proxy
4. Execute the below command to remove your namespace.
$ curl -H "Content-Type: application/json" -X PUT --dataa-binary @tmp.json http://127.0.0.1:8001/api/v1/namespaces/${YOUR_NAMESPACE}/finalize
it works fine for my environment, microk8s version 1.25