@Abdelmonem Ali, Thanks for posting in Q&A. Based on my researching, global admin don't have permissions to view or manage VL user roles in the Microsoft 365 admin center unless a VL admin has assigned them a role.
Every VL contract has at least one designated VL admin responsible for registering the licenses and managing VL roles. Please sign in with VL admin to manage it.
Hope the above information can help. If you want to know more about this, you can ask in Microsoft 365 community to get more help.
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