Cesium Get v1/assets but returning 404 error

In the former topic(Cesium v1/assets endpoints returning 404 error), I have known that we should subscribed to the corresponding assets, but in Cesium-Sandcastle-3Dtiles, some Ion IonResource, such as AssetId(5737), AssetId(8564) and so on, I cannot subscribe to those. So how to fix that?

Besides, an interesting truth is that few weeks ago I can afford to that without accesstoken, and now it doesn’t work with or withour accesstoken.