Dear Rupert Nedd,
Thank you for sharing the details about being disconnected during support chats and the issues with duplicate OneDrive accounts. Disconnections can occur if the session times out or if there is a temporary connectivity issue. For the duplicate accounts and process malfunctions, the recommended step is to sign in to the Microsoft account portal and review the OneDrive account list. Removing or unlinking duplicate accounts from the device settings can help restore normal functionality. It is also advisable to clear cached credentials and ensure that the latest OneDrive client is installed. If the issue persists, creating a support request through the Microsoft 365 Admin Center or the OneDrive support page will connect you directly to the engineering team for further assistance.
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Best regards,
QQ.