I had a hell of a time getting WiFi roaming to work in my house between Omada APs in a low-interference suburban neighborhood.

Any combination of 802.11r and k/v seemed to just cause my phone's connection to drop for minutes at a time when moving around the house.

I wish I could remember my exact solution for you, I believe I just turned off 802.11r and k/v, set channel selection to automatic, and undid any manual or automatic power tuning.