Did you get an email with the notification that Blackbaud / eTapestry is updating to cloud operations on a Microsoft Azure Environment?
If you have an active license and a recent version of an eTapestry plugin, you will find an input field in your Forms>Settings>Plugin where you can change the endpoint.
The new endpoint will be https://etapestry.sky.blackbaud.com/v3messaging/service?WSDL
Just update and save your settings.