Hello @Tejendra Prasad Patel , the timeout error could be related to highly loaded or unavailable network connection. you can try increasing the HttpClient timeout Providing your own HttpClient and proxy using MSAL.NET. Internally, the Microsoft Identity Web authentication library relies on MSAL.NET.
If the issue persists please Collect a network trace in the browser and send us the exported HAR file to azcommunity@microsoft.com with Subject Attn: Alfredo Revilla.
Let us know if you need additional assistance. If the answer was helpful, please accept it and rate it so that others facing a similar issue can easily find a solution.