Not working in Unity 2021.3.13f1

[LesBonsOeufs]

Simply put, I've installed the plugin and this method stops at the "Task.Delay" line:

private async Task FailFeedback()
        {
            if (failFeedbackTmp == null)
                return;

            failFeedbackTmp.DOKill();
            failFeedbackTmp.alpha = 1f;
            failFeedbackTmp.gameObject.SetActive(true);

            await Task.Delay(50);

            failFeedbackTmp.DOFade(0f, 2f)
                .OnComplete(() => failFeedbackTmp.gameObject.SetActive(false));
        }