A listing must have all of the listing details in full to have the Signature product activated.
For example, if the sublocation hasn't been selected on your listing it will not be marked as Signature.
Additionally, if you are an agent, please make sure you have the privileges to mark listings as Signature, and your agency has enough credits available.
If you are unable to find your sub location or require further assistance please reach out to us at support@bayut.com.