Doorbell Pro 2 - Not use Pro Power Kit v3?

Doorbell pro 2 wired connected to mechanical chime(verified on the compatibility list). Transformer is good(shows 17v and power level 1 in app). Mechanical chime will only ring once then never ring again when ring doorbell button is pressed. Manually connecting wires at doorbell will make it ring so i know doorbell itself works. Seems like it will start working again if i disconnected the Pro Power Kit v3 at the doorbell. What exactly does the Pro Power Kit v3 do? What damage /ill effects will happen if the Pro Power Kit v3 is not connected. Its bad enough when the doorbell button is pushed the doorbell will only ring once until the 50 second video length time passes but now it wont even ring the mechanical chime I have come across a few people using the V2 pro power kit rather than v3 that comes with the doorbell pro 2 to fix the mechanical doorbell issue of not working...anyone chime in on that? It would be nice to know exactly what the pro power kits accomplish to be able to make a decision if i am comfrotable not using any If i would decide to bypass the doorbell and wire ring doorbell directly to transformer, do i need to use the Pro Power Kit v3 in the direct wire config?