+1 — exact same issue here. Confirming this is widespread.
WABA ID: 1613095986713103 / Phone: +54 9 11 7154-0390 / SMB account.
Embedded signup: error #2655093 "max partners assigned" (showing 0 partners and 0 apps in my Meta Business Manager — Meta has stale internal state from a removed previous BSP).
@Juank — for what it's worth, manual configuration also doesn't work for SMB accounts. I tried System User Token + webhook config (all verified OK), but you can't call /
/register on SMB (error #100 "Register endpoint is not available for SMB businesses") and outbound messages return #133010 "Account not registered".
So both paths are dead end right now for SMB businesses. Botpress team — can someone please escalate this? Meta and WhatsApp support are bouncing me back and forth saying "contact the other one".