No live View with 3 Echo Show and Doorbell 3

Hi there! I got a Doorbell 3 and 3 Echo’s, I was able to see Live View on my Echos until my trial plan ends. When I try to open now its given me an error “there are already a several people added to the camera so I can’t add you to the conversation” (I translate from German) and it ends.
Do anyone know what to do? I ctc Alexa support they told me to ctc Ring but both were not able to solve my issue.