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This error happens because your Power Platform environment name contains invalid characters. The system expects the environment host name to use only letters, numbers, and dashes but your environment is named ~default, which includes the tilde (~), so Power Automate can’t generate the API endpoint.
How to Fix It
You must create a new environment with a valid name because the built‑in Default environment cannot be renamed.
Steps:
Go to Power Platform Admin Center → Environments.
Select New Environment.
Give it a name using letters, numbers, or dashes only (e.g., certification-reminders).
Create or use a Dataverse database if needed.
Build your flow inside this new environment.
Once you switch to an environment with a valid hostname, the error disappears and you can continue building your monthly reminder flow.
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