You need to ensure you have shared your 'asset' with ATLAS. Use the steps below to guide you.
Go to your Assets and search for the workbook. To the right of the workbook name there are icons. Check that the clipboard icon with the share symbol is highlighted and has a 1 next to it.
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Click on the icon to open a side panel with details of the workbook including the workspaces shared with. Check the workspace name is correct and that 'Accepted' is green.

Follow PebblePad's guide on how to Share an asset with ATLAS
Callout
This option is not ideal but a last resort if the above steps have been attempted and you are still having issues.
Follow PebblePad's guide on how to Share an asset with people