Running a SQL Restore fails with very little byte count and an error indicating there is insufficient permissions.
V-79-65323-3110 - User does not have permission to RESTORE database 'DATABASENAME'.
This can occur if the System Logon Account doesn't have the neccessary SQL permissions even if the account being used to run the restore does.
Give the System Logon Account the neccessary SQL permissions, or change the System Logon Account to one which does.
See the following article:
Understanding Logon Accounts and required User Rights Assignment to resolve connection, backup or restore failures