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Power Automate - Using Connectors
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OneDrive for Business Convert File (Excel -> PDF) failing with 406 (Not Acceptable) error

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Hi all,
 
I've had a flow that has been working without issues for several weeks, but since last Thursday 9th October it has broken, despite no changes to the files or flow. The issue is with the Convert File action on the OneDrive for Business connector, which is converting an Excel file to PDF. It has suddenly started failing with a 406 (Not Acceptable) error:
 
"body": {
    "status"406,
    "message""Conversion of this file to PDF is not supported. (cannotOpenFile / Error from Office Service. Url=https://euc.excelcs.officeapps.live.com/document/export/pdf HttpCode=InternalServerError)",
    "source""api.connectorp.svc.ms"
}
 
 
I have pulled the offending action into a standalone flow on a different environment and get the same error.
 
The Excel file contains tables, although they are outside the print area. Removing the tables normally fixes the issue, and adding a new table back into the file causes it to break again. But I need the tables to be there as part of the overall process, and it never used to be an issue.
 
The behaviour is also inconsistent as sometimes it will start working with a particular file which was previously failing despite not changing it. 
 
Has anyone else experienced any weird behaviour since last week, or have any ideas? I have raised this with Microsoft support but so far they're stumped.
 
Many thanks,
James
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