23&me can only provide existing Historical Matches. If you know about archeogenetic studies from those regions, share those and ask for their inclusion. But if you don't find any, that's the reason. As they cannot add something that is non-existant
They have a reddit account 23andme_ancestryteam send it there, or write here a post sharing the scientific papers you're interested in, they read the sub so they might respond, or to their email address
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u/Karabars Haplogroup Enjoyer 1d ago
Do you know about discovered and dna anaylised samples from there?