You can activate specific failures manually via ixeg failures left side menu and also via xplane flight->edit failures menu
Or, if you are interested on having random failures for non standard procedures training you may consider this script by Tom
REFERENCES BELOW:
are the packs set to auto? maybe you forgot them to OFF during engine startup? unfortunately your screen capture is very restrictive and i can not see the packs.
please make a full overhead panel capture next time, also forward panel screen capture to see everything and give you better support