RE: Power automate - Enabled the PO workflow- Pending approval email needs to get triggered every hour until its approved the PO
A PO approval request sent every hour would seem a little out of proportion to me.
If PO approvals cannot wait for more that 1 hour, then I would consider reassigning the workflow items to other approvers instead, as the approver might be inable to approve that quickly.
You can check this thread which discusses a similar issue and how to use escalation paths trying to solve it:
community.dynamics.com/.../942047
Note that this thread does not utilize power automate, but it also seems like the hourly approval request from Power Automate, is not adressing the core issue, but instead will just be spamming workers.
I would advice you to reconsider your approach to this issue.