Response status codes indicate whether a specific HTTP request has been completed. Here are the types of response codes.
With these response codes, we decide if Microsoft 365 is down or not.
If our test shows that Microsoft 365 is up, but you still can't access it, follow these tips.
If our tool shows that Microsoft 365 is down, then you can not do much to solve it. Just wait for Microsoft 365 to solve the issue.