McNeill is a Cal transfer. No reason has been made public for the decision to deny the waiver. SMU is planning on appealing.
https://smu.rivals.com/news/report-darius-mcneill-denied-ncaa-waiver-smu-to-appeal
https://smu.rivals.com/news/report-darius-mcneill-denied-ncaa-waiver-smu-to-appeal