Thank you for asking this question on the **Microsoft Q&A Platform. **
If you have a subscription for Office 365, you have a tenant, but do not necessarily have an Azure Subscription.
You can validate that you have an Azure Subscription in https://portal.azure.com/#view/Microsoft_Azure_Billing/SubscriptionsBlade
If you have a subscription, you can use it, otherwise, you can create it
Hope this helps,
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