That will never be solved due to the design of Excel.
But you can use a workaround:
Add a non-numeric char anywhere (front or end):
B1: ="x"&A1
Apply the CF on that column.
Andreas.
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There is a bug on the Microsoft 365 Apps-Excel.
The function "conditional format --> duplicate values " can't recognize the number(stored as text) larger than 14 digits. If the text length is longer than 14, and the former 14 byte is same while the left is different, the function will only judge the first 14 byte, and give the conclusion that the data are same.
Hope it could be solved soon.
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really helps.
thanks so much~
PS: sames the function"remove duplicates" use a different logic, it will recognize the long number (stored as text), and keep the different ones.