Is it obligatory to repeat a prayer when the worshiper doubts whether it was Asr, Maghrib, or Isha, while having performed the first sitting, but forgetting the Ibrahimiyah prayer in the final tashahhud due to ignorance of it being a pillar?

The obligatory minimum for invoking blessings upon the Prophet is to say: "Allahumma salli 'ala Muhammad (O Allah, send blessings upon Muhammad)." Anything beyond that is supererogatory (Sunnah). If the obligatory minimum of invoking blessings upon the Prophet is omitted in the final Tashahhud due to ignorance, scholars have differed on whether one is required to make up (qaḍāʾ) the prayer after learning of this condition. The view that is given in fatwas is that making up the prayer is obligatory. The other view is that it is not obligatory, and this was chosen by Ibn Taymiyyah, who argued that the Prophet, peace and blessings be upon him, did not command the one who prayed incorrectly to make up what he missed, nor did he command the woman experiencing istihada (prolonged non-menstrual bleeding) to make up the prayers she missed, nor did he command Umar and Ammar to make up the prayer for which they did not perform tayammum. For precautionary reasons, the prayer should be repeated.