Unable to self-host with "Single Community"

(#583) Bug Fixed self-hosting

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Comment by @ComagHaveFun
RexSystem 1 vote edited originally by @ComagHaveFun on GitHub
Same here. Response of [400] POST /admin/instance-config/update: {"code":"INSTANCE_POLICY_TRANSITION_NOT_ALLOWED","message":"This instance policy change is not allowed."} Edit: Seems that setup was already completed somehow, maybe was related to #587 that caused 500 Internal Server Error on first completion attempt.