You can see the instructions for this connection using this instruction link
The Amazon Echo Flex and SYLVANIA SMART+ ZigBee Soft White A19 Bulb can communicate with each other using a bridge. This bridge is necessary because there is no shared connection between the two devices.
With the Sylvania OSRAM Lightify Wireless Gateway Hub, The SYLVANIA SMART+ ZigBee Soft White A19 Bulb's Wi-Fi can connect to the bridge, and the bridge can connect to the Zigbee connection of the SYLVANIA SMART+ ZigBee Soft White A19 Bulb. The Sylvania OSRAM Lightify Wireless Gateway Hub also has Amazon Alexa compatibility, ensuring the connection can be made.
Another compatiblity is to use the connections between the third party Samsung SmartThings Hub 3rd Generation with the SYLVANIA SMART+ ZigBee Soft White A19 Bulb. This method can use the bridge to connect to the Zigbee connection of the SYLVANIA SMART+ ZigBee Soft White A19 Bulb. The Samsung SmartThings Hub 3rd Generation also has Amazon Alexa compatibility, allowing all of the devices to communicate to each other.
Interface Compatibility
 Amazon Echo Flex |
 Sylvania OSRAM Lightify Wireless Gateway Hub * Bridge required |
 SYLVANIA SMART+ ZigBee Soft White A19 Bulb |
|
|---|---|---|---|
| Amazon Alexa | Yes | Yes | Yes |
| Apple HomeKit | No | No | No |
| Google Assistant | No | Yes | Yes |
Connection Compatibility
|
Amazon Echo Flex |
Sylvania OSRAM Lightify Wireless Gateway Hub * Bridge required |
SYLVANIA SMART+ ZigBee Soft White A19 Bulb |
|
|---|---|---|---|
| Amazon Sidewalk | No | No | No |
| Bluetooth | Yes | No | No |
| Clear Connect | No | No | No |
| Thread | No | No | No |
| Wi-Fi | Yes | Yes | No |
| Z-Wave | No | No | No |
| Zigbee | No | Yes | Yes |