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Office Online Server 2019 Excel Online error

We are integrating OOS 2019 ( latest update ) with our application and everything works great with Word and Powerpoint files but we are having issues with Excel files.
Any file we try to open online has this error: Data culture English (en) is not supported. Data culture English (United States) (en-us) is being used instead. Click OK to view the workbook using data culture English (United States) (en-us).

Once we click OK nothing shows up.

Server side we see the following errors which appear to be related:

Hosted Office Online Office Online common ahe2c Medium Requested UI Culture '9' is different from the fall back culture '1033' 50468c41-c0db-45be-b9b8-7775d4f566f4

Hosted Excel Online Excel Calculation Services 3si7 Medium ExcelServerRegionalSettings.CurrentDataCulture: Set the current thread's data culture to LCID 9 'en' (English). 50468c41-c0db-45be-b9b8-7775d4f566f4

Anyone else encountered this ?

office-online-server-generaloffice-online-server-view-editoffice-online-server-deployment
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Hi @GeorgeBreahna-8322
Will there be the same problem if it is opened on the local client?

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no, it opens fine

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For what it's worth, the same exact problem has already been reported here but I don't see an answer to it

https://answers.microsoft.com/en-us/msoffice/forum/all/i-canopen-excel-online/3be4db16-6160-47e9-9aeb-b6e7dd61210b

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"en" is a neutral culture and not one supported by SharePoint/Office Online Server; en-US (LCID 1033) is supported. With that being said, I do not know how/why your Excel document would have a neutral culture nor how to change it :-)

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GeorgeBreahna-8322 answered

App was calling OOS with ui=en&rs=en , switched to ui=en-us&rs=en-us and now it works as expected.

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