Microsoft

If you ever see your Connection fail due to an error such as: “The refresh token has expired due to inactivity”, you should set up an automated process to refresh the token every X days/months, depending on the requirements. For pre-built Connections, you may opt to create a Flow that uses each active Connection once for the purposes of a token refresh. That way, even if your Flows are inactive for periods of time, the Connections will remain valid and ready to be used once new activity occurs.

Use a Service Principal for Connections that allow them, such as the Dataverse and some custom connectors. The benefits of using a Service principal are outlined here.

Keep Connection References removed from solutions that you deploy regularly to Production. Connections and Connection References should be created once and deployed once to the target organizations. Removing them from your deployment solutions can prevent unintended changes to them.