The #N/A formula was due to the fact the match item in Sheet A had an extra space at the end... the matches have to be exact so delete that space....
Also, instead of entering the string into the formula, why not just reference the item in column A of sheets B and C....
e.g. instead of =VLOOKUP("SEPCM00024823",'Sheet A'!$A$2:$C$8,3,0) try using =VLOOKUP(A2,'Sheet A'!$A$2:$C$8,3,0) copied down.
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