Entered characters of key are incorrect

What causes this issue?

The characters from the key that you entered do not match the correct
data.

System Response

The key generation operation is terminated.

How to fix this error?

Repeat the entire operation.
We do not intend to provide an option to correct the entry, and given
the purpose of the procedure, it would not be meaningful to do so.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.