Hi Christian Dahl Olin,
When the Azure Portal interface becomes unresponsive for updating Azure Analysis Services firewall rules, utilizing command-line tools is the most effective immediate workaround. You can bypass the portal glitch entirely by using the Azure CLI environment. Running the command az analysis services server update along with the --ipv4-firewall-rules parameter allows you to push your network changes directly to the management plane. You simply pass a formatted string containing your rule name, starting IP, and ending IP, which seamlessly bypasses the localized web interface hang and updates the security configuration in the backend.
The difficulty you are experiencing with opening a support ticket directly from the resource blade is likely tied to the same localized portal rendering bug affecting the drop-down menus. To successfully open a ticket, search for the global Help + support service in the top search bar of the Azure Portal. Initiating your support request from this global hub allows you to manually specify your subscription, service type, and the affected Analysis Services resource. This approach completely circumvents the contextual errors and missing parent drop-down options occurring on the specific resource menu.
Hope this answer brings you some helpful information. If it does, please hit "accept answer" to help others in the cummunity.
Domic V.