Hello vmathur87,
Thanks for your question.
Are you on a free trial or Student Subscription? This looks like it is related to Trial subscriptions, Upgrading the plan to Pay as you solved the issue for other customers.
See related Thread: https://learn.microsoft.com/en-us/answers/questions/1530524/how-to-fix-(tasksoperationsnotallowed)-acr-tasks-r
Please let me know if you have further questions
You can mark it 'Accept Answer' if this helped.