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From what you have described, it looks like the account you are using is euther a guest that doesnt have the required permissions or you are in the wrong directory.
Can you try this in an incognito tab and verify you are the owner of the subscription? Use the steps here:
I'd also recommend opening a ticket with Azure Billing Support:
https://azure.microsoft.com/en-ca/support/create-ticket
You can mark it 'Accept Answer' and 'Upvote' if this helped you
Regards,
Abiola