This means that this learner could be on another training provider’s / employer’s digital accounts. We have had a few of these. The best thing to do is to ask the apprentice or the employer where the learner was prior to your current apprenticeship. The old employer will need to Stop the entry on their DAS side. Another reason could be that there is an incorrect and duplicated ULN within your apprentices.
Another tip is that if the learner was in the Army previously and is still on the Army Digital account then the new employer will need to contact The Apprenticeship Service to get the old record cleared.
These are all scenarios we have had in the past year, so hopefully you will be able to find out why you are getting this error.