FC25 (PS25). Cant set up training in calendar in manager career

Hi, I’m playing FC25 on PS5 in Manager Career Mode. I took over a club mid-season and selected “manual” training plans at the start. I’ve played several months, but training sessions never show up in the calendar. I can’t schedule any training for my players – no blue icons appear and pressing X on any day does nothing.
I’ve checked all settings. This seems like a bug. Please help.