I would you to investigate to determine the cause of the problem that occurred in the sandbox environment as well as the production environment. Microsoft considers the sandbox environment to be a testing environment and one that has no real business impact. So, Microsoft informed us that they could not investigate the cause of the problem that occurred in the sandbox environment.

However, we are performing the task of testing in a sandbox environment. If a problem occurs during testing, the client's operations will be halted and testing operations will be affected.

Therefore, Microsoft should investigate the cause of problems encountered in the sandbox environment. Microsoft should recognize that both production and sandbox environments are important to customers.