grant df shows up as office on many people's GCMS notes. You can request your own GCMS notes by looking up ATIP request and making a FREE request under the Privacy Act. It shows officer's notes about your file. Many people who have been waiting have grant DF in their notes. From what I've seen, after grant df, they leave a new note about a final review indicating grant df is some sort of final review that not everyone is subject to. Though, as I've said, this is my speculation, IRCC agents don't say the meaning of it, so it's kind of a secret.