The register
The register lists Tassen Limited in London as a licensed sponsor on Skilled Worker, an entry that goes back to at least 2026. Rating on the current register: Worker (A rating).
At Companies House the business is Tassen Limited (company number 11223106), a private limited company incorporated in 2018, 8 years ago. Registered office: 16-17 Little Portland Street, London, W1W 8BP, W1W 8BP. By its SIC codes the business is in hospitality.
What the licence tells a candidate is that the door is not locked. Whether it is open this month is a question for Tassen Limited's own careers page and the job boards, and the answer changes with the season and the order book.