INDEX/ MATCH formula works for few rows and has #NO MATCH error for remaining rows

Hello,
I have an urgent deliverable and hope some one can please help me

I have 2 sheets and trying to bring data from sheet 1 to sheet 2 using a INDEX MATCH formula.

The issue is the formula will work for a few rows and has #NO MATCH error for remaining rows. This means that the formula works. I am stumped as to why it is not working for other rows

Similarly, I have other fields that I am trying to bring over as well which has the same issue

FORMULA : on Target Sheet

=INDEX({IDMC -JIRA Link}, MATCH([INFA JIRA Ticket Ref]@row, {IDMC Key}))

SECOND EXAMPLE- Same issue

FORMULA-

=INDEX({IDMC Defect Root Cause}, MATCH([INFA JIRA Ticket Ref]@row, {IDMC Key}))

Answers

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