People using Slack all around complains about outages and weird bugs in services, notifications, calls, connections, search, messaging, integrated apps, APIs, link previews, posting, and workplace/organization administration.
Slack reports that “Degraded service affecting multiple features”
and that ” Functionality is almost back to normal, but some users may see some sporadic problems while we work on remediation. “
you can follow on updates from the official Slack system status page in the link below