"We've received reports of users being unable to access Microsoft Teams or leverage any features. We're investigating the issue and further updates can be found in your Service Health Dashboard via TM402718."[1] - 20220721T0147Z
Both Teams and Slack are problematic, we are using IRC at our small team, and it's been just better, the nature of IRC allows easy bot/scripting, wich is all you need for your integration needs
[1] https://twitter.com/MSFT365Status/status/1549934141738651648