Azure App Service is a service used to create and deploy scalable, mission-critical web apps.
@Murat-6632, Apologies for the delay in responding on this over the weekend. I completely understand the frustration with this issue you’re encountering.
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I have checked this on multiple subscriptions and I'm able to access 'Advanced Management Portal' fine (screencast below).
To better assist you on this, just to clarify, do you recall making any changes to your subscription prior to this issue (or are you noticing this for the first time on your subscription/account)? And do you have admin/co-admin permission on the subscription?
You could capture a network trace via F12 developer tools in the browser to fetch more details on the error.
Advanced Management portal is managed by GoDaddy.
You can go directly to your Godaddy account, and once you’re in the Domain Manager, try to access the link for your domain - https://dns.secureserver.net/yourdomain/nameservers
Direct URLs “dcc.secureserver.net” and “dns.secureserver.net”