Set password for pmi, instant meeting with func setPassword(String s) of meeting item not works

Meeting SDK Android
1
  1. I get PMI and set password for this pmi , it isn’t works , password of pmi same default.
  2. I start a instant meeting, and get meetingnumber with func inmeetingService.getCurrentmeetingnumber after get meetingItem with func preMeetingService.getMeetingbyUniqueId() this func always return null.
    3.How i can set null of password for a meeting(PMI, instant meeting).
    Please help me and thanks you very much