So, I’m active, not AGR, but hopefully this helps.
Did you actually submit an application for the bonus through the MyPers website (does ARPC do it that way?)
I ask because I transferred from the Navy in Aug19 and immediately asked AFPC about the bonus. Due to admin stuff associated with my transfer, the lady running the program couldn’t get me paperwork to sign until Oct 19,!well after the cutoff date. Since I had applied online before the cutoff date, I was allowed to remain on the FY19 program even though I didn’t have an approved application until after the due date.