I've started to see this today (July 8th 2024) in all deployment notifications:

Action Required: O365 connectors within Teams will be deprecated and notifications from this service will stop. Learn more about the timing and how the Workflows app provides a more flexible and secure experience. If you want to continue receiving these types of messages, you can use a workflow to post messages from a webhook request. Set up workflow

On Friday July 5th 2024 the normal deployment notification was being shown.

I'm using Argo CD v2.11.4 and have been using it on both days.

Their time line looks pretty aggressive:

• Wave 1 – effective August 15th, 2024: All new Connector creation will be blocked within all clouds
• Wave 2 – effective October 1st, 2024: All connectors within all clouds will stop working

Will this require a code change on the Argo CD side of things? I know there's generic webhook connector support built into Argo CD but based on glancing the docs, it would be a pretty big quality of life hit to use that vs how easy it was to use the Teams integration.