We are trying to Register a SoftPhone using the Register Device API available in RingCentral. However, we are getting the "device is not allowed for other" if we are using the SoftPhone device id as the Input parameter. Please refer the screenshot below:

Here, we are using the "WSS" transport type to register the Ringcentral Softphone. Also, we noticed that if we are not providing the device id, api gives the 200 Ok response code. It returns the SIP Information of the WebPhone instead of the Softphone (already assigned to the user) .

Kindly help to resolve this issue.