Modern Events Calendar Related Events

Hey guys,

we got the Modern Events Calendar Pro and we want to show the related events inside the Single Event pages. But somehow, the Related Events do not show up in the Feed. We can see that the feed is on the page, but it’s just a blank field.
We added the categories and tags, but it doesn’t seem to work. It works fine for posts about the event, just not for the event page itself.

Can you help with this issue?

Many thanks in advance.