always with the problems wrote:
I have the same problem with admin PW for FileVault.
BTW, blaming the user "You must have done..." is never an acceptable answer.
@etresoft actually did explain what the user most likely did wrong & was not insulting the user. Many times when macOS prompts a user for authentication, macOS by default tends to fill in the current macOS user name which for the OP is the wrong user name to be used since their personal account is not an admin user. So yes, the OP most likely used the incorrect credentials by accident.....I've had this happen to me on occasion as well.
However, as @PRP_53 has pointed out, it seems it may be required that Filevault can only be enabled while currently logged into an admin user account. If this is the case, then it seems macOS has a bug if it pretends to allow a Standard user account to enable Filevault which you can report here:
Product Feedback - Apple
FYI, here is the relevant portion from the Filevault article @PRP_53 linked originally. Granted the wording is vague since it does not specifically mention you must be currently logged into an admin user account. Apple is not great with documentation these days.
To set up FileVault, you must be an administrator.
Try enabling Filevault while logged into a macOS admin user account.
