Measurements of the CMB temperature–polarization (TE) and polarization–polarization (EE) power spectra at large angular scales (low multipoles l?30) show hints of suppressed correlations and features that are not perfectly matched by the best-fit ΛCDM model calibrated on smaller scales, analogous to but statistically somewhat independent from the low-l temperature power deficit (Page et al. 2007; Planck Collaboration V 2020). Because ΛCDM with simple, nearly scale-invariant primordial perturbations predicts smooth TE/EE spectra across these scales, explaining the joint low-l anomalies in T, E, and their cross-correlation often requires invoking special initial conditions, modified reionization histories, or non-standard early-universe physics beyond the minimal hot Big Bang plus single-field inflation scenario (Mortonson & Hu 2008; Di Valentino et al. 2019).