Hello Britto Gilbert,
Thanks for your question.
Based on this information it is very likely there was a previous user before it was transferred to you.
If MS Visual Studio was transferred to you, it was not a new fresh subscription. Azure Credits benefit was already activated by the previous user and was attached to previous users email address.
I suggest to logon with the previous user account and to transfer the "Visual Studio Enterprise" subscription by following Transfer billing ownership of an Azure subscription to another account
You can confirm the above information from who assigned you the subscription.
You can mark it 'Accept Answer' and 'Upvote' if this helped you
Regards,
Abiola