Is acting upon the preponderance of belief that one did not say "Subhana Rabbi al-A'la" (Glory be to my Lord, the Most High) during prostration correct, and what are the consequences if it is incorrect, and is it obligatory for someone who finds this difficult to make up for it?

Scholars differed concerning the ruling on the glorifications (tasbeehaat) in bowing (ruku') and prostration (sujood). The view of the majority (jumhoor) is that they are a Sunnah, not obligatory, and whoever intentionally omits them, their prayer is still valid. Whereas the Hanbalis held them to be obligatory, such that whoever intentionally omits them, their prayer is nullified, and whoever omits them due to forgetfulness or ignorance must perform the prostration of forgetfulness (sujood as-sahw). The preponderant opinion is that of the majority, and accordingly, there is nothing due from one who omits them. If a person is afflicted by whispers (waswaas), they must disregard these whispers. As for past errors in prayer, if they rendered the prayer invalid, then its re-performance (qadaa') is obligatory according to the majority. However, Ibn Taymiyyah held that re-performance is not obligatory for someone ignorant of the ruling. Studying fiqh and Islamic knowledge does not bring waswaas, but rather tranquility.