FAQ - Why can’t we archive the accounts of some learners that have completed their apprenticeship? An error has appeared "This user is included in ILR batch file and can't be archived. If you wish to proceed, please mark the ILR as unfunded."
Check if the learner's programme has been stopped on their profile, if it hasn’t, then they are still effectively "live" from the system's point of view. Stop the learner's programme and you can then archive them