54156: Invalid List Item data

This error occurs when you send Data as null in a Sync List item request. For create requests, include the data body parameter and pass a JSON string that represents a schema-less object. A ListItem can store up to 16 KiB of data.

• You tried to create a List item without including the Data parameter in the request body.
• You passed Data as null instead of a JSON string.

• Include the Data parameter in the request body when you create the List item. The create endpoint accepts application/x-www-form-urlencoded input and requires data.
• Send Data as a serialized UTF-8 JSON object, such as {}, instead of null.
• If you update an existing List item, only send data when you want to change the stored object, and make sure the value is still a JSON string.
• Keep the List item payload at or below 16 KiB.

• ListItem resource
• Sync: Shared state in the cloud
• Sync Objects Time-To-Live (TTL)