بسم الله الرحمن الرحيم
(Fatwa: 1122/868/H=9/1434)
Salah was valid and complete. However, iqamah was completed by two persons, it was makrooh. If after qad qamatis salah the next sentence was not remembered and he could not say it instead of reiteration then it was better for the other person to say iqamah from the beginning. However, it caused no karahat in your salah.
Allah knows Best!
Darul Ifta,
Darul Uloom Deoband
