Ensure the account used is a member of the local administrators group. Creating & managing users this article explains how to manage user accounts in a vault from the admin > users & groups > vault users page with the user object. Super users can assign vault profiles to users, and admin users can assign vault profiles to users in their sites
"Error: User [Username] does not have adequate permissions to log into
Vault profiles provide vault information and credentials so that computers can back up data to and restore data from a vault.
Some of our clients have found the need to delete the local vault user profile to resolve a variety of issues
In a previous post i illustrated how to do this via the command line for vault versions 2025 and later.