There is not a way to extend the trial period. You need to have subscriptions (either paid or the subscriptions that come as part of MSDN to continue using your account.
Extend credits
Jenil Desai
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Can I get an extension or additional credits for continued learning as my 30-day trial period has ended?
Azure Cost Management
Azure Cost Management
A Microsoft offering that enables tracking of cloud usage and expenditures for Azure and other cloud providers.
3,613 questions