This is not authentic and it is not from the sunnah.

sheikh, there is a prayer after the Maghrib and sunnah, i’ve always known it as “salatul awwabbin”. Where you can pray either 2, 4 or 6 raqaa. Can you please help clarify this for me? And what this prayer is really called?

Prayer | May 21, 2017 5:01 pm
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If a man enters the mosque with the the intention to pray dhur and he finds that the congregation has already said the salams…then he finds one man praying by himself who also missed the jamat. What should this person do at this point?
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I was tolled that when reading the sunnah pray such as 2 sunnah before fajr or 4 before zuhr the intention should be reading it to give the reward of the pray to the Messenger of Allah. such as the 2 rakat reward reach the messenger of Allah