Microsoft service failure had triggered the major Xbox outage
Everything was back up and running by 2:30pm PT on Monday, but now Microsoft has revealed what exactly went wrong to cause this widespread disruption.
Xbox players were having a bad time trying to jump into their games or access their library yesterday. The servers behind the Microsoft gaming wing were dark for most of the day due to a major outage affecting games, accounts, the store, and even mobile services. Everything was back up and running by 2:30pm PT on Monday, but now Microsoft has revealed what exactly went wrong to cause this widespread disruption.
Xbox Chief Technical Officer Scott Van Vliet posted a lengthy report on social media today that apologized for the issues and shared some information, revealing that it was a separate Microsoft licensing service shared across its products that had caused the Xbox dominoes to fall.
"Late last night, a licensing service that sits outside of XBOX, but which XBOX depends upon, began failing. This caused some sign-in scenarios to fail, and it caused many scenarios that require an entitlement check to also fail," said Vliet. "It also affected several of our publishing and store partners who depend on those same systems which is why some of you saw issues in specific games and not others."
Once Xbox's overnight monitoring team realized what was going on, it had isolated the failing infrastructure and tried to find the root of the issue. Services had come online region by region as the team shifted traffic to healthy parts of the system and resolved the original cause by 2:30pm PT.
Vliet said that instead of focusing on the bug that brought the systems down, the main point of the current post-incident investigations is finding out why one failing service caused so much damage and why recovery took so long.
It's an internal service at Microsoft that is shared across multiple products, not some random system. Sorry that wasn't clear, will be better about future updates.
— Scott Van Vliet (@scottvanvliet) July 28, 2026
"That means hardening the dependencies underneath sign in and game launch, improving how we detect and contain this class of failure, and being faster and clearer with you when something breaks," added the CTO. "Thank you for your patience, and for the reports that genuinely helped us narrow this down. We'll do better."
Sony was also on the receiving end of a major PlayStation Network outage last week affecting its games and accounts, though the company has not yet elaborated on what caused that issue.