Thank you for post!
Based on the error message you received; it seems that the resource group 'learn-863f910a-xxxx-xxxx-xxxx-4c6f3e30d049' could not be found. This error message suggests that there may be an issue with the resource group or the subscription that you are trying to access.
To resolve this issue, you may want to check if the resource group 'learn-863f910a-xxxx-xxxx-xxxx-4c6f3e30d049' exists in the subscription that you are trying to access. If the resource group does not exist, you may want to create a resource group.
Reference: Create a key vault using the Azure CLI
Hope this helps. Do let us know if you any further queries by responding in the comments section.
Thanks,
Akhilesh.
If this answers your query, do click Accept Answer and Yes for was this answer helpful. And, if you have any further query do let us know.