Until recently, the --env parameter for edr report only accepted dev or prod as valid values. This was a common limitation and is well-documented in several sources, where users attempting to use other values (like stage or uat) received errors stating that only dev or prod were allowed [CLI commands and usage](https://docs.elementary-data.com/oss/cli-commands#cli-options), [Slack discussion](https://slack.com/archives/C02CTC89LAX/p1679892116976529), [Slack discussion](https://slack.com/archives/C02CTC89LAX/p1689859988450969). However, as of version 0.16+, this restriction has been lifted, and you can now use custom environment names (such as stage, int, etc.) with the --env flag. If you are using a version prior to 0.16, you will encounter an error when using anything other than dev or prod. Upgrading to version 0.16 or later will allow you to specify your desired environment name [Slack discussion](https://slack.com/archives/C02CTC89LAX/p1726176545966149). So, if you want to use --env stage, make sure you are running Elementary version 0.16 or higher.