The Jamf Teacher application relies on a managed app config to integrate with Jamf Pro's API. Ensure we've configured the app config found under Configuring and Distributing the Jamf Teacher App in the following article: https://learn.jamf.com/en-US/bundle/jamf-pro-documentation-current/page/Jamf_Teacher_Integration_with_Jamf_Pro.html

If Jamf Teacher launched with a misconfigured or incorrect app config, completely closing and relaunching the app can resolve the issue and allow end users to access Jamf Teacher again.

To refresh the app configuration for Jamf Teacher and confirm the application is using the most up to date app configuration, uninstall and reinstall the application.
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Use the following guide to confirm the action being taken by the end user is available with the Jamf Pro version of Jamf Teacher: https://learn.jamf.com/en-US/bundle/jamf-teacher-configuration-guide/page/Feature_Reference_for_Jamf_Teacher.html