Conditional formatting not highlighting entire row

Hi All
I'm sure I'm missing something here, but no matter what I try I can't get conditional formatting to highlight an entire row based on the value in certain cells.
This is even the case on a tiny example spreadsheet I've created with no other formatting on it, so I'm sure I'm doing something wrong.
This is the rule:
spreadsheet ex 1.png

Detail here:
spreadsheet ex 2.png

Which gives this:
spreadsheet ex 3.png

I'm also not able to attach the spreadsheet to this post for some reason? I'm guessing I should be using the paperclip icon?

Edit: Should say this is in O365 (desktop).

What am I doing wrong?

TIA

Si

You didn't fix B1:

=$B1="x"

should do it.

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