Now first before starting , some of you and for some reason recognize sasuke's rinnegan as the third eye
Now I know it may look like it a little but no it's not
The third eye and here's why:
First the only 3 people that had the third eye were hagoromo, madara and kaguya and all 3 of them had 2 rinnegan's and the third eye so it's safe to assume that you need 2 rinnegan's to obtain the third eye
2-madara acknowledged sasuke eye as "rinnegan" with this statement " he unlocked his rinnegan" madara knew about third eye he would've noticed it right away if it was the third eye, plus BZ said " is it his rinnegan ability" referring to sasuke eye and bz is also experienced and would've know it but no he only said rinngan
Here's sasuke saying rinngan (referring to his eye)
Now that we know that sasuke was able to"cancel" the genjutsu with 1 eye , what makes you think that nagato with 2 eyes can't do it
Sasuke literary said "a genjutsu created by a rinnegan can be canceled by another rinngan. ......."
So in conclusion nagato cannot be affected by IT or any other RINNEGAN genjutsu
Note: I know that this was somwhat obvious but my main point was to clear that sasuke eye wasn't the third eye cause some people still think it is
Now I know it may look like it a little but no it's not
The third eye and here's why:
First the only 3 people that had the third eye were hagoromo, madara and kaguya and all 3 of them had 2 rinnegan's and the third eye so it's safe to assume that you need 2 rinnegan's to obtain the third eye
2-madara acknowledged sasuke eye as "rinnegan" with this statement " he unlocked his rinnegan" madara knew about third eye he would've noticed it right away if it was the third eye, plus BZ said " is it his rinnegan ability" referring to sasuke eye and bz is also experienced and would've know it but no he only said rinngan
Here's sasuke saying rinngan (referring to his eye)
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Now that we know that sasuke was able to"cancel" the genjutsu with 1 eye , what makes you think that nagato with 2 eyes can't do it
Sasuke literary said "a genjutsu created by a rinnegan can be canceled by another rinngan. ......."
So in conclusion nagato cannot be affected by IT or any other RINNEGAN genjutsu
Note: I know that this was somwhat obvious but my main point was to clear that sasuke eye wasn't the third eye cause some people still think it is