Account locked due to inactivity
If you've been locked out of Case Center due to inactivity, you'll receive an email that includes a link to unlock your account.
If you don't get the email in your inbox, wait 15 minutes and then check your spam/junk folder. Also check your company filters, as you might have a filter that is blocking these emails, and the email may be trapped there
There is an option at the organization level to lock a user’s account automatically if there hasn’t been a recorded login within N number of days. The default setting is 365 days, but you can configure the number of days.