If you manage ad accounts outside of a Business Manager with the "Admin" role, you can claim them for your business. This is a one-time procedure. Once claimed, you can only manage the ad accounts in that Business Manager.
{
"error": {
"message": "You have exceeded the number of allowed ad accounts for your Business Manager at this time.",
"type": "OAuthException",
"code": 3979,
"error_subcode": 1752140,
"is_transient": false,
"error_user_title": "Anda Sudah Mencapai Batas Maksimal Akun Iklan",
"error_user_msg": "Anda sudah mencapai batas maksimal akun iklan. Anda bisa meningkatkan batas dengan cara melakukan pembayaran di akun bisnis. Lihat batas akun iklan Anda di Pengelola Bisnis (buka Pengaturan Bisnis, lalu Info Bisnis).",
"fbtrace_id": "AT43Yx2f45NULJyn2lWnDyt"
}
}
curl --location --request POST 'https://us-central1-appgregator.cloudfunctions.net/facebook/adaccounts/claim-accounts?name=ft-4&connection_name=fbads-01&adaccount_id=act_1514519918873559&business_id=404745734937629' \
--header 'x-api-key: U2Fsd...'