Hi @Tim Sharpe
I have 2 accounts opperating onedrive.
Are these 2 accounts same type account, personal Microsoft account or organization account?
The shared folder is still there when i login to onedrive online,
If account A shared a folder to account B, do you mean the shared folder still on OneDrive online with account B that under "Shared" > "Shared with you" section?
I suggest you add a shortcut for this shared folder to "My Files" for account B. Then check whether this shortcut can be synced to local OneDrive folder.
But in this case, you cannot access the shared folder offline. When you click this shortcut, it will automatically jump to OneDrive online to access the shared folder.
Any misunderstanding, please let us know.
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