Solution
Due to this issue, the TEDS palette under Measurement I/O is not available. Download the attached TEDS Toolkit Support packages for your version of LabVIEW and run it after installing NI CompactRIO 21.0 to use the TEDS Vis in your application.
If a previous version of this toolkit (LabVIEW 2018 –2020) is already installed, upgrading to CompactRIO 21.0 does not remove the TEDS palette.