If I'm using a domain account to connect to SQL Server, what could cause error 18456?

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Grade: Education Subject: Support
If I'm using a domain account to connect to SQL Server, what could cause error 18456?
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Even when using domain accounts, error 18456 can occur if the domain account doesn't have the necessary permissions within SQL Server. Ensure the domain account has been mapped to a SQL Server login and has appropriate database access rights. Also, verify Kerberos delegation is configured correctly if the application is accessing resources on a different server.