If you can access the portal perform the steps belpw:
Go to portal.azure.com and search for and select "Subscriptions" in the top search bar. This will take you to the Subscriptions blade.
Select the subscription name to display more details. You can see the subscription ID and compare to what was provided
The above is cited from: https://learn.microsoft.com/en-us/azure/azure-portal/get-subscription-tenant-id
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Regards,
Abiola