I'm running Win10, build 16299 and using Krita Gemini V2.9 Pre-Alpha off Steam. I'm using the Adesso M14 USB tablet. After modifying sensitivity settings in Settings > Configure Krita > Tablet Settings and in brush-specific settings, I still have no pressure sensitivity. It's still all, nothing, or sporadic dots because the pressure is on or off, no in-between. I just. Really am not sure where to proceed from here? Nor really what other information you may need, but I'll be more than happy to collect what's necessary and update this with it - just tell me everything to find and I'll share it.
Please check the manual first: https://docs.krita.org/Drawing_Tablets, go through all the possible options, then check if it also happens with Krita 3.3 you can get from krita.org, we have changed a lot since the 2.8 version.
I'm sorry, but if a tablet isn't recognized by a recent version of Krita, it's always a driver/setup problem, not a bug in Krita. At least one person has gotten his Adesso tablet to work: https://docs.krita.org/List_of_Tablets_Supported There isn't anything we can do about it in any case because we do not have access to the hardware.