If 22-13 is set to a second "area" for in 22-10 for your night mode(2) then make sure in 22-11 for those areas you have your actual Voicemail pilot number at night.
22-12 Will only come into affect if 22-09-02 is set for Intercept and then yes 22-12 will by default ring ,ring group 1
So I believe you may not have the area (101-200 is default) in 22-11 for the range you use at night.
Remember you have a "area" for day 1-100 and night 101-200

Area 1 for example would be for your day main number just like SK said, (1) for 22-11-05 and (102) 22-11-06 for the Voicemail Group (102 is a system design it is not actually extension 102)and for Night
in area 101 in 22-11-02 Put the actual Voicemail pilot number for your main DID sending the calls directly to VM
So you would have a duplicate record for your DIDs for extensions in areas 1-100 and 101-200, the only difference would be your Main Numbers or any other number you want to be re-directed.
22-12 Only comes to affect if there is not a DID built in the Area that 22-13 is looking at depending on the mode.

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