Slack signage on a laptop computer in the Brooklyn Borough of New York, U.S., on Tuesday, Dec. 1, 2020.

Gabby Jones | Bloomberg | Getty Images

Slack said on Thursday that its workplace messaging app is back online after users briefly reported issues earlier in the day.

On Thursday morning, Slack had said that customers were having issues sending messages.

“Slack is now back up. Users may need to reload their apps to see this restoration,” the company said in an update around 6 a.m. ET. “We appreciate your patience during our investigation of this outage.”

According to the outage flagging site Downdetector, Slack began experiencing issues just before 5 a.m. ET. The problems peaked at around 5:30 a.m., with 5,000 users reporting issues with the platform.  

Tests conducted by CNBC confirmed messages were now sending.