The user account {EmailHidden} does not exist

Error:

##[error]An initialization error occurred -> AADSTS50034: The user account {EmailHidden} does not exist in the 4eb27e18-209a-fa9d-696537fce2bbb88d directory. To sign into this application, the account must be added to the directory.: Status Code: 0

Resolution:

The Sync is failing because the service account (simeon@tenant_domain_name) has been removed from the tenant. 

To resolve this:

• Navigate to Configuration Manager
• Select “Install”
• Toggle off “New Tenant”
• Select tenant
• Click “INSTALL”

Alternatively, if you don't want to use the Simeon service account, you can use delegated authentication.