Does this issue persist all the time? Or what changes do you do before happened?
Could any other admins change the settings of Auto Attendant properly?
I try to modify the auto attendant settings in my lab and found that if I make any changes, business hours will be reset to default. A workaround is to reenter the Business hours when you change other settings in auto attendant.
We will work on this problem and any update I will share with you here.
If the response is helpful, please click "Accept Answer" and upvote it.
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.