In case anyone else has problems with Fast Roaming with Apple devices I have found that disabling the Private MAC address cycling fixes the issues.
Symptom: I was constantly finding MSTeams was having to reconnect when moving around my house on calls.
Deco M5 - 1.5.3 Build 20210203 Rel. 68223 (in AP Mode)
Apple Iphone 8 running IOS 14.7.1
Apologies if this is already a known issue/limitation, but thought I would post it just in case as I didnt see this when I searched?