E_BLUETOOTH_ATT_INSUFFICIENT_ENCRYPTION_KEY_SIZE

The Encryption Key Size used for encrypting this link is insufficient.

Matched as: the code as given (hex)

HRESULT breakdown: code: 12, customer: False, facility: 101, severity: failure (bit 31 set), ntstatus_wrapped: False

Source: COM Error Codes (WPN, MBN, P2P, Bluetooth) (Winerror.h) · CC BY 4.0 · wording unchanged, formatting adapted for this site · retrieved 2026-10-24