Cannot adjust tileset location

Hi,

I have converted an IFC file to 3D Tiles in FME with the Cesium 3D Tiles writer.
This results in one JSON file and B3DM files.
When I try to add the data to Cesium ION, the tileset does load but I cannot adjust the tileset location.
When I hover over the ‘Adjust Tileset Location’ button, the mouse cursor changes into a forbidden / prohibition sign.
Only the bounding box of the tileset is shown, but nothing is in it.
I use the correct coordinate systems for reading and writing of the file, so I do not think that’s the problem.

Below is a screenshot of the My Assets page of Cesium ion with the bounding box of the tileset shown.

Does any of you know how to fix this issue?

Thanks in advance,

Rohit