From Tamron:
Dear users and potential purchasers of Tamron interchangeable lenses.
Thank you for using Tamron products and for your continuous support.
We would like to announce that we have clarified compatibility for general operations (*1) of the following Tamron Di & Di II lenses with the latest version of lens firmware (*2) when used with the Nikon Z6 and Nikon mount adapter FTZ.
*1 Defined to work on existing DSLR cameras
*2 Firmware for Nikon Z7 (announced on November 16th and 22nd, 2018)
Compatible models for general operations
The lens firmware can be updated with the separately sold TAP-in Console.