Answered by Shaykh Faraz Rabbani
I heard it is recommended to seek forgiveness between the two sajdas? But books don’t seem to say this?
Ibn Abidin mentions in his Radd al-Muhtar (“Al-Hashiya”) that though there is no specific recommendation within the Hanafi school for any invocations between the two prostrations, such invocations are not disliked. He said that it would be recommended to seek forgiveness (by saying Rabbi’Gfirlee twice), as some other mujtahids have deemed it necessary, and the general principle is that it is recommended to take into account the differences of other mujtahids, as long as it does not entail doing anything disliked (even somewhat disliked) in our own school.