It is narrated from Sayyiduna Abu Ayyub (may Allah be pleased with him) that he said: I prayed Maghrib and Isha with the Prophet (peace and blessings be upon him) at Muzdalifah with one iqamah, and he did not mention the adhan.
Al-Hasan bin Umarah is not used as evidence.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 1890