A free program from Microsoft that provides developers with the tools, resources, and sandbox environments needed to build solutions for Microsoft 365.
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Hi 家强 杨 ,
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Thank you for sharing the details.
Based on what you shared, the Microsoft 365 Developer subscription had already expired in 2024, and the available period to back up data has now passed, as mentioned in the following reference: Microsoft 365 Developer Program FAQ | Microsoft Learn
As a result, your request to access the sandbox environment for data backup can no longer be processed, since the data would have been deleted after the retention period.
I understand this may not be the outcome you were hoping for, and I sincerely appreciate your understanding. I hope this provides additional insight.
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