ANSWER:

We cannot know but must have good hope in Allah as Allah is as His servant thinks of Him. 

https://islamqa.info/en/answers/107701/conditions-of-the-validity-of-prayer

QUESTION: How to know that allah has accepted our Salah or not? Any revelations?

Prayer | December 20, 2022 4:55 am
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QUESTION: As regards, 2 units of suna before fajr, when you are lait and the jamaa is on for the fajar fard prayer is that you pray suna first and then join the fard or join the fard first. what are the thoughts of scholars in this regard.as a moulana from the sub continent says according to Hanafi and Maliki you can pray suna first and then join the congregation of fard
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QUESTION: When the imam is leading and for example he says allahu akbar and goes into sujood. Do we silently say allahu akbar as well? Or is it just the imam who says allahu akbar