Studio 2021 and 2019 concurrently?

Hello. I recently changed the PC I work with, I have a Studio 2021 licence but was always able to concurrently also run Studio 2019 based on a prior licence I had -- Now I can no longer do so, the message being: "Aktivierung fehlgeschlagen. Login for this product key has been restricted. Contact the system administrator for assistance. It has also become VERY cumbersome to actually find and contact a system administrators -- so I hope to soon hear back here.  Deactivating the 2019 licence on the old PC is also not possible, same message. How can this be fixed? Thanks a lot in advance!

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