ANSWER:

You can make dua in whichever sajda you want or you can make it in all of them, no problem in that. Specifying only the last Rakah is not recommended and can fall under innovation.  

Kindly refer to the following link(s):

 

Hope you are well. I was wondering whether you only make dua in, say for example the last raka of a four raka / two raka or whether you can do several different duas during eac sujood in each raka ?

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