The MOST likely cause of the failure in the custom VM deployment script to join the LDAP domain, even when the account has the correct permissions, is:
**D. Expired password.**
Here's why:
LDAP authentication typically relies on username and password credentials to establish trust between a system and the LDAP server. If the password for the account being used in the deployment script has expired, it will prevent successful authentication and the ability to join the LDAP domain.
To resolve this issue, the cloud administrator should verify the password's expiration status and update it if necessary. Additionally, it's essential to ensure that the script is correctly handling password authentication, including any password change requirements.