ECS CE 3.2.2.0 - Max number of tokens exceeded for this user

Hi All,
I am using ECS CE 3.2.2.0 , installation all in one node. I developed microservices that call ECS REST API Management on port 4443 using ECS system admin user.
 
When I make many calls to ECS API to perform standard functionalities (for example to read namespaces, buckets, object users lists, metering data etc) obtaining different tokens for the same unique system admin, I receive error message I post below and I have to wait 60 minutes before making other new API calls . Does ECS CE 3.2.2.0 work in this limited way? Could I have more details about API calls limitations for ECS Community Edition, please?

Thank you in advance

SG

Status: 401 Unauthorized

{"code":4000,
"retryable":false,
"description":"Invalid credentials or authentication token provided to access to this resource","details":"Max number of tokens exceeded for this user"}