You need to ensure your workflow allows the transition. That is, check to see if the WF has a transition back to ready for review. If not add the transition. I might suggest using the "All" transition option thus allowing any status to be transitioned to from any other status unless of course you want/need a rigid WF.
no worries at all. glad to help.
prerequisite - So you need to be an admin (either for the project or a system admin)
You can find more in the docs - Workflows
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