Hi Everyone! I am Julie with our Desktop, Mobile, and Core Applications Specialist Team.
We have seen an influx of cases with this exact behavior, and we believe it to be a bug related to the latest update from Microsoft.
If you would, please ensure your version of Excel is up-to-date.
We have already engaged the Product and Engineering Teams, and they are currently working with Microsoft Engineering to debug this issue.
If you would, please reproduce the error and follow the steps below to send feedback directly to the Microsoft Engineering team:
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Date and time of error production
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File name and location that triggered error
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Send feedback to Microsoft from the Excel app to inform them of the error. Be sure to include a unique identifier, such as #WOPIBoxCoAuth, in the comment box to make your feedback searchable.
This data will help the Microsoft team isolate the root of the problem so they can work to implement a fix for the behavior.
Another symptom to note is that workbooks will open with auto-save OFF when opening from Box.Com > Open with Excel Desktop or opening Excel files directly through Office > Box as a Connect Service. Trying to toggle auto-save on tends to create a duplicate file and can cause versioning issues.
At this time, the only known workaround is to leverage Box for Office Online when working with Excel files as the online services do not seem to be impacted by the bug.
UPDATE:
As of 4pm CST on 12/11 Microsoft has fully rolled back the release on Excel causing this issue. Users should no longer encounter this error.
