SimpliSafe Video Doorbells causing buzzing / humming at doorbell chime

I installed two Video Doorbells and all was working fine except there was a very loud buzz/hum coming from the doorbell chime box inside the house.

I called Customer Support and they said they would send me a "Chime Connector" which would solve the problem.  I received and installed the Chime Connector and the buzzing/humming decreased in volume but did not go away and it is still unacceptably loud.

Has anyone had the buzzing/humming issue and, if so, have you found a way to eliminate it?

Thanks for your help!

-- Mike