If you see this then some of your applications are probably experiencing issues with MapTiler Cloud service.
The “maps.tilehosting.com” domain was shut down on Thursday, February 27, 2020.
The MapTiler Cloud service now runs on the new “api.maptiler.com” domain. There are also other changes in the URLs logic. Please refer to your account administration to get the correct URLs for your application.</b>
Blog post: New domain and infrastructure upgrade