Yes, it is possible to report on the LRN. The field is "UserILRSummary_LRN" in the Users table.
- The Users table in OData contains ILR reference numbers related to a learner.
- The LRN for a learner can be found in the field "UserILRSummary_LRN"
- The ULN for a learner can be found in the field "UserILRSummary_ULN"
Please refer to the OData dictionary for a full list of data fields.