Hi, I'm John!
You're not alone, many users are currently experiencing the same issue with Outlook. It appears to be a widespread connectivity problem. Impacted users may include, but are not limited to, iOS users and other devices that use mobile chip such as new Mac Neo.
You can check the official service status here: https://portal.office.com/servicestatus/ expand “Microsoft consumer products”and look for the Outlook.com section for details.
For now, please wait until Microsoft resolves the issue and try again later.
I really hope this information is helpful!