Is the Hadith: "Whoever prays Fajr in congregation and then sits in his prayer place, reciting three verses from Surat Al-An'am, seventy angels will be assigned to him, glorifying Allah and seeking forgiveness for him until the Day of Judgment," authentic?

The hadith in question is only found in Kanz al-Ummal and attributed to al-Daylami, on the authority of Ibn Mas'ud. Its wording is: "Whoever prays Fajr in congregation, then sits in his prayer place and recites three verses from the beginning of Surah Al-An'am, Allah will entrust seventy angels to him who will glorify Allah and seek forgiveness for him until the Day of Resurrection."