Ring Pro and with Nutone

Hello everyone, I am trying to setup a new Ring Pro with a chime that is in a Nutone intercom. I don't have the model or anything because it only says Nutone on the cover. My issue is I do not know where to connect the power pro kit v2. I attached a photo of the inside of the intercom for reference. I connected the Ring Pro to the doorbell connection already but there is no power, so I am thinking either it is because the kit is not installed or I would have to check the transformer. I am very new at this but any help is appreciated. TIA Tony