Hi - I recieved same as above. School will not provide an updated LOA because you are already enrolled. Just upload the LOE and follow up in webform explaining why LOE is uploaded and not LOA.
applied 12/1/19 (2nd application: long wait but worth it due to pandemic)
aip 9/8/20; enrolled Fall 2020 Centennial College: IRCC requested updated LOA 10/22/20 (sent in LOE instead); opr 11/11/20; from Phils