Custom "Recommended Learning" alert is not working as expected

Summary:

Worklist Error: ${AlertUtils.person(learningRecommendations.assignedToId).UserName}

Content (please ensure you mask any confidential information):

Error received:

Error in ${AlertUtils.person(learningRecommendations.assignedToId).UserName} Execution Cannot get property 'assignedToId' on null object

I cannot find any answers within the community or any previous queries with this specific worklist.

Is that part actually useable "learningRecommendations.assignedToId" for Alerts to employees about recommended learnings?

thank you

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Code Snippet (add any code snippets that support your topic, if applicable):