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The Juʿfi man, as you can see, is unnamed and therefore unknown.
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Concerning Muhammad ibn Yazid, al-Bukhari said: “I found them unanimously agreed on his weakness.”
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“Say: ‘O Allah, forgive me, have mercy on me, grant me well-being, and provide for me’”—while bringing his fingers together, except for the thumb—“for these encompass for you your worldly life and your Hereafter.”
Muslim (8/71), Ibn Majah (2/433), and Ahmad (3/472 and 6/394) transmitted it through Yazid ibn Harun, from Abu Malik al-Ashjaʿi, from his father, who heard the Prophet, peace and blessings be upon him. A man came to him and said, “O Messenger of Allah, what should I say when I ask my Lord?” He said the above. This is Muslim’s wording. Ahmad said, “and guide me,” in place of “grant me well-being.” ʿAbd al-Wahid ibn Ziyad likewise narrated it from Abu Malik. Muslim and Ahmad also transmitted it, except that he omitted both expressions altogether. Abu Muʿawiyah combined the two, narrating from Abu Malik al-Ashjaʿi with the wording: “When a man embraced Islam, the Prophet, peace and blessings be upon him, would teach him the prayer, then instruct him to supplicate with these words ...” He then mentioned all five.
It also has a supporting narration from Saʿd ibn Abi Waqqas, attributed to the Prophet, peace and blessings be upon him, with similar wording. It states: “Say: ‘O Allah, forgive me ...’” and then mentions the five, but one of its narrators, Musa al-Juhani, said in his narration from him: “As for ‘grant me well-being,’ I am uncertain; I do not know.”
I say: The other narration contains no uncertainty concerning this expression, and it is established through the chains of the first hadith. Thus, the stronger view is that it contains all five phrases. And Allah knows best. Al-Mundhiri erred regarding the hadith of al-Ashjaʿi, citing it as a narration in the hadith of Saʿd. See my comment on this hadith in Sahih al-Targhib, no. (14/7).