Hello Bomasi Confidence Nwakegho
Welcome to Microsoft Q&A Platform, thanks for posting your query here.
ACR is temporarily pausing ACR Tasks runs from Azure free credits. Refer: https://learn.microsoft.com/en-us/azure/container-registry/container-registry-tasks-overview#what-is-acr-tasks
If your subscription is a free trail this could be the reason why this is failing.
Hope this helps.