The request message is too big. The server does not allow messages larger than 2097152 bytes
What causes it and how to fix it:
- A REST write over 2 MB fails with "The request message is too big"SharePoint Online rejects any REST request whose body exceeds 2,097,152 bytes (after JSON escaping, in UTF-8). A multi-line text field in a list holds far more than that – the cap is the request, not the field – so measure body bytes and split large JSON into parts.Cause and fix →