In the TEST environment, all TSS that are in the status DISABLED or have been inactive for more than 14 days are deleted every Sunday. All related resources are removed and the affected TSS are set to the status DELETED in the database.
If the TSS limit in the TEST environment has been reached, new TSS can be created by setting existing TSS to DISABLED.
The following article explains how to disable a TSS: SIGN DE - How can I disable a TSS?