Due to a platform-known issue, in rare conditions, users cannot edit or make changes to a Lightning application’s utility bar if it contains the iManage Featured Items lightning component and changes to its properties are made.

When saving the Utility Bar, the user may be greeted with an error that does not allow saving.

We can't save your changes because one or more of your utilities doesn't exist.  Try again or ensure that all your utilities are valid.

Workaround

Remove the iManage Featured Items Lightning component from the utility bar, re-add it, and then save the utility bar.