Getting error in sandbox when creating file -  The AWS Access Key Id you provided does not exist in our records

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Full error message:  The AWS Access Key Id you provided does not exist in our records. (Service: Amazon S3; Status Code: 403; Error Code: InvalidAccessKeyId; Request ID: The app is on sandbox running fine for a few months then suddenly stopped working.   Any clues as to what is going on and what I can do about it? Things I tried: * redeploy      
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I filed a support ticket and was advised to unlink the app in the portal (at Environments) and redeploy, thus creating a new version of the container which should no longer have issue with the use of the AWS S3 file storage . THIS WILL DELETE ALL DATA. I had a backup, but since you can't upload and restore a backup in a free app, I had to import the database locally and create export/import functionality to get my data back in the new sandbox app. So beware! Create export/import tooling first if you want to keep your data. Mendix Support said it was a known issue and solved (this was September 16.), but I still had trouble generating files.

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Quick and dirty workaround:
1. Upload the same code under a new app then deploy
2. Use URLRedirector widget to redirect users from original to new app

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Hi Andrej,

There were similar issues reported a while ago in Sandbox. And Mendix support was able to fix it. 

https://forum.mendix.com/link/questions/102526

https://forum.mendix.com/link/questions/102275

The error you are facing looks very similar.

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