Is there any way to repeat the call for a Power Automate flow in case of failure? Or is any way to have the topic continue instead of straight up crashing?
Copilot Studio does not have the ability to retry a call to power automate if it fails. Error / re-try should be handled in your power automate flow (ie: if flow fails return an error and, in your copilot, display that error / branch out based on the value of the flow output).