HI @Azure_Inf ,
If you want to domain-join your Azure VM to your on-premises Active Directory (AD) you need to either:
1. Establish a connection between on-premises to an Azure Virtual Network:
https://learn.microsoft.com/en-us/office365/enterprise/connect-an-on-premises-network-to-a-microsoft-azure-virtual-network
2. Use Azure Active Directory Domain Services:
https://azure.microsoft.com/en-us/services/active-directory-ds/
Here's also a guide on how to accomplish this:
Join an Azure VM to an on-prem Active Directory
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(If the reply was helpful please don't forget to upvote or accept as answer, thank you)
Best regards,
Leon