The html viewer stopped working for one of our customers. The site has not been updated since Feb 2023. At first, I thought that the issue was related to CORS, but after changing the project to allow all methods, all origins, basically accepting all requests, the viewer continued to throw the exception attached.
Any guidance as to what to review on the clients browsers to troubleshoot this issue will be highly appreciated. When trying from different locations, the same report works as expected. I think that something is blocking the CORS headers somehow.
The front-end is an angular application, backend is on an azure app service. This exception is only happening for just a set of users. we have used Chrome, Edge and Firefox.
The error is also happening from an Ipad when using Chrome and Safari.