I could not find a trigger for when an Azure DevOps / TFS Release Management Deployment completes. There appears to be one for the Build, but not the Release Deployment. A trigger would prove useful for providing notifications to a group in MS Teams about a failure. This allows for alternative forms of notification other than just e-mail.
Also, since it appears that Flow supports "approval flows", are there any plans to allow Deployment approvals to be made through it? It would afford another opportunity to get away from the e-mail.