Rashi on Exodus
ודבר אל בני ישראל … וראו AND HE SPOKE UNTO THE CHILDREN OF ISRAEL… AND THEY SAW the rays of glory on his face; and when he moved away from them ...
Rashbam on Exodus
יסיר את המסוה, whenever Moses had to convey G’d’s instructions to the people he still did not cover his forehead with the cloth he had removed in order to communicate with G’d. Once he concluded conveying G’d’s words he would again cover his forehead. When G’d would address him, or he would wish to address G’d, he did so without wearing the מסוה.
Rav Hirsch on Torah
VV. 34 u. 35. Mosche Bescheidenheit ließ es nicht zu, anders als wenn er vor Gott einging oder im Namen Gottes zu reden hatte, sich mit strahlendem Angesicht zu zeigen.