I'm also having issues with this. Having attempted to re-sign in through the Invalid Connection link, the Data > Connections page, and deleting / recreating the connections, each confirming on the Connections page to have been recently modified from the sign ins, but still receiving the same error for my Forms and Excel connectors. I have no issues directly accessing the specific products being referenced, and am able to see and interact with the form being referenced as well as the excel sheets. Please fix this asap.
