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Dear C_Ro,
Thanks for posting in Microsoft community.
We go through your description and understand you are having trouble when trying to purchase an App.
We search this error message and find out the users had the same error solved this behavior with the private mode of the browser. You may try if change a browser or using a private window in browser could solve this error.
Meanwhile, we would like to confirm if your colleagues have the same error message.
Thanks for your cooperation, look forward to your reply.
Have a good day.
Sincerely,
Sean Cai | Microsoft Community Moderator
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