Anas (May Allah be pleased with him) reported:
The Messenger of Allah (ﷺ) said: "The supplication made between the Adhan and the Iqamah is never rejected."[Abu Dawud and At-Tirmidhi]. (DE)
App reference (DE): Book 9, Hadith 51 (DE)
English reference (DE): Book 9, Hadith 1041 (DE)
Arabic reference (DE): Book 9, Hadith 1043 (DE)