If your variant is missing there, the following requirements must be checked:

1. In the Tab: Availability of the respective variant, the availability "OTTO Market" must be set.
2. In the Tab: Properties of the respective variant, the property "OTTO Category Group" must be set. The format name of the respective OTTO catalogue is expected as the selection value.
   This link assigns the variant to the respective OTTO catalogue (this corresponds to the OTTO category group).
   The name of the format is expected, NOT the name of the catalogue you assigned!
3. The variant is activated.