Function refusal 

fn refusal(
    status: u16,
    error: &str,
    codes: &[u64],
    description: &str,
    personal: Option<bool>,
    step: Step,
) -> SyncError

What Microsoft’s refusal means, as Sioul says it: OAuth’s error, Entra’s codes (error_codes, else the description’s AADSTS), the account’s kind when known, and the step.