Microsoft Corp MSFT.O said late Monday a recent change it presented likely caused a significant blackout, influencing clients’ access to different Microsoft 365 services, including Outlook.com and Microsoft Teams.

The developer of Windows and Office software said it didn’t “observe an increase in successful connections” even after it moved back the change to moderate the effect.

“A moment ago nothing was working, then I went into files in Teams and it was working, now nothing is working. Well I guess now I have an excuse to not do work and watch TV,” one Twitter user tweeted.

“We’re pursuing mitigation steps for this issue. In parallel, we’re rerouting traffic to alternate systems to provide further relief to the affected users,” Microsoft said on its status page, without specifying how many users were affected.

A few other Twitter clients complained that the blackout implied they could miss their job interviews and deadline for college assignments.