With the built-in Ecobee support, you need to redo the login authentication to get things working again.
If I may, I suggest looking at my Ecobee Suite as an alternative to the built-in support. It is far more resilient, recovers automatically from most Ecobee server/API failures, and offers a sweet suite of Helper applications to better integrate Ecobee into your Hubitat home automations...oh, and it is free.
