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Community Advisor

In your screenshot, do the 2nd tab blurred correspond to a custom contact table replacing nms:recipient?
As in this screenshot of ACC documentation for Seed address:
https://docs.campaign.adobe.com/doc/AC/en/CFG_Use_a_custom_recipient_table_Seed_addresses.html

In that case, the firstname should be rather filled in the 2nd tab instead.

Do you use FDA for custom contact table instead?