Hi @Gobinath N ,
Welcome to Q&A forum!
To help you better, could you please describe the error message in detail or share a screenshot with us?
What is the extension of the file you are trying to collaborate on? Please note that "Co-authoring is only supported on modern file formats including: .docx (Word), .pptx (PowerPoint), and .xlsx (Excel)".
For more information about co-authoring, please refer to: Document collaboration and co-authoring.
Any updates, please let me know.
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