Ok so there were 2 problems. Sheet name was wrong, it should be 'Jan Change Names'. There were no spaces in the code because that's what you shown to me in post #5
The next problem is, the cell B2 in Jan Change Names was result of a longgg concatenation. And in your formula it has many spaces included as well (in the concatenation). Data validation input message has a maximum length limit of 254 characters. If your cell B2 ends up being longer than 254 characters, this will give you an error.
We can, however, avoid the error by first trimming the cell value (this removes redundant spaces), and then take the first 254 characters only.
You can also change it to this if you want it to be displayed as the first 251 characters and followed by "..." if it is longer than 254 characters
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