In SQL Server 2016 I receive this error with STRING_SPLIT function
SELECT * FROM STRING_SPLIT(\'a,b,c\',\',\')
Error:
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I was using Split_string, which felt grammatically correct in English, but my old eyes didn't see that it should be STRING_SPLIT ... so, if you're a bit mentally challenged like me, then check you've typed the command the right way! :)
Split_string
STRING_SPLIT