Training: Instruction to develop new skills.
Unfortunately these are no longer available. More at https://learn.microsoft.com/en-us/training/support/faq?pivots=sandbox#are-sandboxes-still-available
Are sandboxes still available?
Sandboxes are no longer available. To complete exercises in training modules, you'll need access to an Azure subscription. If you don't have one yet, you can sign up for a free 30-day Azure trial or a pay-as-you-go subscription.
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hth
Marcin