You need to sign into the Azure portal as an account owner to manage the subscription. The account owner is the person who originally and they are the one who can cancel the subscription or change subscription details. So if someone other than you has that permission they can either make the changes or transfer the billing ownership to you.
You can check for your Azure subscription under the tenant in the Portal or via CLI. https://learn.microsoft.com/en-us/azure/media-services/latest/setup-azure-subscription-how-to?tabs=portal
If there is no other admin on the tenant you can contact the Azure Data Protection team (866-807-5850), or if you think you add the right access but are still having trouble you can reach out to the Billing team.
Based on your screenshots though it looks like you may not be the subscription owner.