Greetings, Muruga! My name is Arif, I'd be pleased to help you as a Microsoft adviser.
Please take the following actions:
Dear Muruga,
Please click on the spreadsheet file you previously pasted into MS Teams and attempt to open it in a web browser before attempting to copay past the table and check.
If not, please try clicking on open in Desktop App, applying the same table, and checking.
For more information kindly check the screenshot, please.
If the steps outlined above work for you, kindly let me know. If not, please feel free to respond to my chat.
Warm Regards,
Arif