Hi James,
If the item ID you are trying to retrieve is not in a Pending state, this action is bound to fail. As both 'Get Next Item' and 'Get Item By ID' only retrieve the pending state items by locking them for further use, hence changing the status to Locked state.
Please check the status of those Item ID's and let us know if they are in 'Pending' state or in some other state before you are executing this action.
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Hope this helps you out and if so, please mark the current thread as the 'Answer', so others can refer to the same for reference in future.
Regards,
Devneet Mohanty,
SS&C Blueprism Community MVP 2024,
Automation Architect,
Wonderbotz India Pvt. Ltd.