Alexa and eufy e340 doorbell

When a person pushed button on eufy e340 doorbell alexa would play chime but as of 3 days ago has since stopped working. Has anyone else experienced the stoppage? I have done multiple unlinksand relinking the 2 systems tono avail. It seems as though alexa will not marry up to eufy any longe4

Unlink all devices, power cycle for 30 minutes before relinking, ensuring all devices are connected & operating on 2.4 GHz WiFi frequency. Check via router portal using your laptop connected to router via ethernet to confirm devices are connected & recognised. Ensure all devices are updated to the latest firmware. Manually assign network IP to each device instead of automatically. This ensures the devices keeps the said network IP instead of rotating between devices that connect/disconnect from your network. Ensure randomised MAC address is off for these devices, you want them to have the same identifier to ensure network and system recognition.