Hey there, Simba Bryn Mahaja
From reading the question, it looks like it is trying to sign you into the Microsoft Services tenant rather than your own tenant. When you select an account, is there more than one account that is the same listed?
Please can you open an InPrivate browsing window for the following site: https://portal.azure.com/#view/Microsoft_Azure_Billing/SubscriptionsBladeV2
You will need to make sure you sign into the right account to view your subscriptions.
Thanks,
Nathan