Trouble connecting to cesium asset

Hi, I did not get access anymore to the CesiumRasterOverlay asset. It worked very well until yesterday and now, I have no Polygon panel visible (to select Cartographic Polygon). In place of it here is a button “Troubleshoot token” and when I click on, it seems that the asset no more exists in my Cesium account or there is no authorization to access to it. When i click on “Authorize access”, Unreal crash …

Thank you for your help