@Nabie welcome to the Microsoft Q&A community.
It looks like the Microsoft.Azure.NotificationHubs NuGet package is currently at version 4.2.0, and while it supports .NET Standard, there isn't explicit mention of browser-related classes2. If you're looking for updates or new features, the best approach would be to check the official Azure Notification Hubs documentation or the NuGet package page for any announcements.
If you need browser-related support, you might want to raise an issue on the official Azure SDK GitHub repository or reach out to Microsoft support. Would you like help finding the right place to submit feedback?
https://learn.microsoft.com/en-us/dotnet/api/overview/azure/notification-hubs?view=azure-dotnet
I hope these helps. Let me know if you have any further questions or need additional assistance.
Also if these answers your query, do click the "Upvote" and click "Accept the answer" of which might be beneficial to other community members reading this thread.