@Golam Dastagir Nahid Thank you for reaching out to us. Happy to assist!
I have heard of rare cases where this error is thrown on a particular browser. Try using the Edge browser or switching to a fresh browser and see if that resolves the problem.
If problem persists, contact Azure Support by raising a support ticket. The ticket enables you to work closely with the support engineers and get a quick resolution to your issue.
Here is the link - https://learn.microsoft.com/en-us/azure/azure-portal/supportability/how-to-create-azure-support-request to create support case.
FYI: Azure Billing and Subscription Management support is included in the Basic Support Plan without any charge.
https://azure.microsoft.com/en-us/support/plans/
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