Yes I'm another who it didn't work for. Also just got it on one character. Was wondering if it was because I'm using a Queen's wrath helm when I used it.
English
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you only get it for one toon. but you can place 5 in the vault to give to a different toon. In total you can have 20. 5 on each toon and 5 in the vault
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I have helm of inmost light and it didn't work for me
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Only other helm I have is skull of dire ahamkara, didn't work when I switched to that either, but figured that was an exotic so not normal as well. All very strange. Worked for my friend though.