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I see that `flow.register()` initializes a Client object with no arguments <https://github.com/PrefectHQ/prefect/blob/4d8337f75fe9bbb3024faa3b74a8f7debbb596d0/src/prefect/core/flow.py#L1663-L1665>. From what I can tell, this will use the api_token value from config.cloud.auth_token (<https://docs.prefect.io/api/latest/client/client.html>). What should we do in a build server scenario? Will `Client()` read from an environment variable if one is set?

From here <https://docs.prefect.io/core/concepts/configuration.html#environment-variables> it looks like I should be able to set `config.cloud.auth_token` by setting `PREFECT__CLOUD__AUTH_TOKEN`. I'll give that a shot

Hi <@ULAGV364C> - using the environment variable should work just fine :slightly_smiling_face:

(but let me know if you have any trouble)