Hello Kignon Abdel Kabir KONE,
The issue almost always lies in how the account is specified within the subscription configuration. The server running the WEC service is attempting to resolve the provided name "XXXX\YYYY" into a unique Security Identifier (SID) for authentication and is failing. This typically happens for one of two reasons: either the account name was entered with a typo, or the WEC server cannot contact the domain controller to resolve that specific domain or account.
I recommend you first verify the account name for any spelling errors. If the name is correct, please ensure that the WEC server has proper network line-of-sight to a Domain Controller that holds the account's domain. A useful test is to try mapping a network drive from the WEC server using the same XXXX\YYYY credentials to confirm it can be resolved.
Once the account is validated, you may need to re-enter it precisely in the subscription manager.
I hope this guidance helps you resolve the SID conversion error promptly. If this answer was helpful, please don't forget to hit "Accept Answer" 😊 .