I think i'm not the only one to have thought of that but i would like to do an extract of all user account from all environment from my cluster management.
I didn't find any information about that in the Dynatrace Documentation and the Support confirmed that extraction of all user account is not available.
It would be a good thing if it can be implemented in a future version of the product.
With User Session Query Language you will be able to extract this information in the UI or by REST API, getting as result a JSON.
USQL is in EAP https://www.dynatrace.com/support/help/how-to-use-dynatrace/real-user-monitoring/how-to-use-real-use...
If you are talking about the users in a Dynatrace Managed cluster, the Cluster Management API does exactly what you want. See documentation:
(it's only available for Dynatrace Managed, not for Dynatrace SaaS)