Solar panel with Gen2 doorbell

Hi I installed the solar panel a couple weeks ago. Before connecting to the doorbell I checked there was a nice charge coming from the connectors with a multimeter. There is and all was well Since connecting the panel to the doorbell not once has it shown up as connected, nor has it charged the doorbell at all. I have just checked again that there is a charge coming from the panel given it is a brilliantly sunny day. Same result, plenty of charge but nothing showing on the app or any sign of the doorbell charging. I have reset the doorbell but no change. Any suggestions? Thank you