What are common causes of the '401 Unauthorized' error when a service ping fails, and how are they resolved?

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Grade: Education Subject: Support
What are common causes of the '401 Unauthorized' error when a service ping fails, and how are they resolved?
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Common causes include incorrect credentials, expired tokens, disabled user accounts, or insufficient permissions. Resolve by ensuring correct credential input, refreshing tokens, enabling user accounts, or granting appropriate access rights within the service's administration panel or identity provider.