Anas reported that the Prophet ﷺ would not raise his hands in any of his supplications except during the prayer for rain, when he would raise them so high that the whiteness of his armpits became visible.
قال كان النبي ﷺ لا يرفع يديه في شيء من دعائه إلا في الاستسقاء، وإنه يرفع يديه حتى يرى بياض إبطيه.
Bukhari narrated it in the Book of Rain-Seeking Prayer (1031), and Muslim in the Book of Rain-Seeking Prayer (896), both through Saeed (who is Ibn Abu Aruba), from Qatada, from Anas bin Malik, who said, and then he mentioned it. Anas's statement, "He would not raise his hands for anything..." is a denial of what he himself observed, and it does not necessarily entail a denial of what others observed. It has been established through multiple corroborating reports on many occasions that the Prophet ﷺ used to raise his hands when making supplication.Some scholars have interpreted this statement of his to mean that he intended to emphasize the extent of raising the hands, to the point that the whiteness of his armpits could be seen, whereas Thabit narrated from Anas, as found in Sahih Muslim (895), a report that does not mention any denial of raising the hands. Rather, he said, "I saw the Messenger of Allah raise his hands in supplication until the whiteness of his armpits could be seen." Likewise, someone other than Thabit narrated from Anas, for Bukhari said (6341), Uwaysi said, Muhammad bin Jafar told me, from Yahya bin Saeed and Sharik, that they both heard Anas report about the Prophet ﷺ, that he raised his hands until the whiteness of his armpits could be seen.So the sahih and established fact about the Prophet ﷺ is that he used to raise his hands in supplication. This is something on which there is no disagreement among the scholars, as far as I know.