TLDR; If you used the Microsoft Teams Incoming Webhook URLs generated before February 2021 you should have updated them before the 1st of July 2021 PST or they won't work anymore.
This related to Microsoft Teams Jira Connector, Automation for Jira, StatusPage, OpsGenie, Microsoft Teams Confluence Connector, Microsoft Teams Bitbucket Connector, Microsoft Teams Bamboo Connector and really any other product that integrates with Microsoft Teams using Incoming Webhook Connector.
You should see a message on the card in Microsoft Teams "You must update this connection to keep using it after June 30, 2021. ".
Got it from this blog post.
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