All scheduled prompts failing — "couldn't be completed" error — Power Platform provisioning issue?

Yeah, this usually isn’t a problem with your flow. If all scheduled runs are failing, it’s often an environment or provisioning issue in Microsoft Power Platform. I’ve seen cases where even new flows fail, which means something is wrong in the backend. You can try reconnecting your connectors or turning the flow off and on once, but if nothing works, it’s most likely a service issue. In that case, you’ll have to wait or contact support.