No "Other nobles" to adopt as Macedon?

[Antiochos VII Sidetes]

Hi all, loving the Macedon update. I just haven't gotten any other nobles to adopt, just existing parties -- and I would add that for whatever reason Antigonos is the only Antigonid atm. Hireable nobles become Local Hellenic, not other nobles. How do I expand my family tree? I cannot adopt anyone.

[Jake Armitage]

check better the adopt intrigue tooltip, there should be a limitation depending on gravitas (maybe) and one for some attribute like zeal/cunning/authority
can't remember.