I would recommend using the map attribution service as the copyrights change with zoom level and location: https://learn.microsoft.com/rest/api/maps/render/get-map-attribution?view=rest-maps-2024-04-01&tabs=HTTP This is the service that the Azure Maps web SDK uses. It does have HTML in the response that you may want to remove if you app isn't a web app. Here is a simple way to do that in c#:
copyrightString = Regex.Replace(copyrightString, "<.*?>", string.Empty)
I'm not sure what the plan is for the Copyright Caption service, it is really outdated and doesn't include all the copyrights. I suspect that one will be shut down in the not too distant future.