@Kumaravel, Nirmal Thanks for reaching out. The ‘Serialization operation failed’ error in Service Bus Explorer usually occurs due to issues with message formatting or data type mismatches. Ensure that the data types you are trying to serialize are supported.
To isolate this, try sending a simple message to see if the issue persists. If the issue only occurs with a specific message, there may be an issue with that message.
do let me know incase of further questions, I would be happy to assist you.