Please look at this gif.
The function call is
=VLOOKUP(A1, A1:B1, 2, FALSE).
1. b 2. c
1. b2. c
the newline character loosed.
You have used the correct formula. However, excel just shows that in one line. click on the cell and do “wrap text”. Then it will show them in two lines.Check this image for reference
Also check this link where there is a similar issue:
I have the french edition but just click on the button surrounded with red,
you can see it works.
If im understanding it correctly . You should probably put them in separate line. For example you can put 1.b in b1 and 2.c in b2 then try the code.