Hi there,
I'm Cherrelyn and thanks for reaching out, I'm here to help.
Right now, it looks like Outlook is experiencing a temporary service interruption, and Microsoft is aware of it. You can check the official Microsoft Service Health page for updates here: https://portal.office.com/servicestatus.
https://portal.office.com/servicestatus/
Thanks for understanding.
Warm regards,
Cherrelyn