Create an Service Account in the 'default' namespace.
So the 'testsa' Service Account is created in the 'default' Namespace.
COMMAND :-
$ kubectl create serviceaccount testsa
serviceaccount/testsa created

So check the token has generated using Secrets for above 'testsa' Service Account.
COMMAND :-
$ kubectl get secrets
NAME                        TYPE                                         DATA            AGE
default-token-pxzf7         kubernetes.io/service-account-token          3               16h
testsa-token-zwhvm          kubernetes.io/service-account-token          3               11s
