Learning App do not show customized content

Hello,

could you please help me to figure out, why our Learning App does not show created content?

• Our Product SAP_S4HANA_ON-PREMISE, SP3
• Product version 2020.002
• We have set workarea ID and link to a folder in the parameters
• Context is captured correctly

By opening web assistant, I see only the button Learning Center, but no book pages or simulations which are related to the opened screen.

Any suggestions, how to make content visible?