Iview not found error when Digital Signature is active

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Symptom
SRM iview not found when Digital Signature is active.
Other terms
“Iview not found” error, Digital Signature, SRM iview, SRM portal error
Reason and Prerequisites
The error occurs when Digital Signature related customizing is not activated correctly.
The customizing entries are not maintained, leading to incorrect/incomplete URL generation.
This faulty URL results in an ‘Iview not found’ error on the SRM [...]