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In IDM versions before 24.R1 that folder did contain all demo keys, which were since removed. Furthermore, the engineSignEncryptConfig.xml shipped in WAR files of 24.R1 and above references additional P12 files not used or not bootstrapped previously (by default we use a dedicated P12 file per descriptor, instead of sharing them).
Refer to List of descriptors of the sign and encrypt engine Bootstrapping Productive Systems to bootstrap any missing keys/certificates.
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