According to the AgentForce Knowledge Integration and Access Configuration Guide, a Service Agent retrieves and grounds its responses using data from Salesforce Knowledge when the correct permissions are assigned. If customers report that the agent cannot access or provide answers from Knowledge articles, the most common root cause is that the AgentForce Service Agent user lacks the “Allow View Knowledge” permission.

This permission enables the agent to retrieve and read published articles from Salesforce Knowledge for grounding responses. Without it, the agent cannot access the content repository, resulting in incomplete or generic answers.

Option B is incorrect because a license issue would prevent the agent from running at all, not selectively block access to specific data. Option C is also incorrect since the Knowledge profile alone does not control article visibility — permission sets do.

Therefore, the correct answer is Option A – The AgentForce Service Agent user was not given the Allow View Knowledge permission set, which grants the necessary access for article-based responses.