As far as I can tell, nothing more than taking away the notice at the top of the app, but there may be more when 2.9 becomes real. Don't freak out if your first log back in fails. It did for me, but the second try worked.
I got that prompt on the phone today as well, even though I've remained logged into the car for years. I had to log out of the car and log in again which prompted a fail to connect "call customer service" message and would not allow me to restore my profile. Tried again later and was able to log into the car followed by the app banner message going away. Such a random glitch.
The other day, my Gravity did the same thing. Center console would not wake up. I walked away for a minute and it still had an issue when I got back. This time I was able to hard reboot. Hasn't happened again
I got that prompt on the phone today as well, even though I've not had a problem since I got the LucidAir 4 years ago. Now cannot get all the info on my phone as I used to. Tried logging out and back in. Will try again tomorrow ..ugh. Is it an update issue?