@kentzversky Bing Maps was officially deprecated by Microsoft starting June 30th, 2025, though because Cesium is a Bing Maps Enterprise customer, our access to Bing Maps that we provide through ion remains in place until 2028. See this blog post for more information: Bing Maps end of life timeline in Cesium ion
Work is being done to add support for Azure Maps - what Microsoft is replacing Bing Maps with - to CesiumJS and Cesium Native Runtimes.