We have a registrar lock enabled to prevent unauthorized domain transfers. Basically, it is recommended to use it with it enabled and to disable it only when transferring.
When transferring a domain from mixhost to another company, it is necessary to remove the registrar lock.
For unlocking procedure
STEP 1: Open My Domain.
From mixhost My Page, click "Domain" → "My Domain".
STEP 2: Open the setting screen of the target domain.
Click the wrench mark for the domain you want to change.
STEP 3: Click "Change Registrar Lock".
STEP 4: Click Disable Registrar Lock.
This completes the operation.