Word Plugin Error: No data can be read from the transmission connection

I want to convert a table from Word into text with defined formatting. Copilot responds with: (Error: No data can be read from the transfer connection: The connection has been closed.)

App/Component: Copilot App in Word

Device/Environment: Local PC

Operating System/Office Version: Win 11/Office 2021 Selected Model: Claude Sonnet 4.6 – US

Steps to reproduce:

1. Open the Copilot App, select the model "Claude Sonnet 4.6 – US"

2. Long table

3. Enter and send "create further sections from the table in the document"

Expected: The table is converted into text with the same formatting.

Actual: Response: create further sections from the table in the document.

Error message (as text): (Error: No data can be read from the transfer connection: The connection has been closed.)