TLDR: If you lack documents to verify your current residential address, contact the company requesting your Thirdfort check for alternative options.
Continuing without Proof of Address documents
If you don't have a document showing your address, speak to the company requesting your Thirdfort check. They can advise on any other documents they may accept, and how they would like you to proceed in the app.
If necessary, other documents can be uploaded in the app. The documents you see listed are recommended options, but not all you can upload.