Forms results automatically posting daily in General Posts

There is a flow setup for it to send the updates of the form as a post to Microsoft Teams, you can simply go to Flow/PowerAutomate section and disable/delete that flow.

Here is how to login and check the flow, flow.microsoft.com/en-us/ signing, and if you have setup the flow or if it is shared with you, then you will be able to delete or tweak changes but if it is created by others with in your org you might not see it.