O365 Group keeps disappearing from outlook

[kmernova]

Exchange on-line

• Group created in teams after ADsync was started on-premise. It was a private team setup.
• After mail migration, Exchange O365 group was created, made public and I am a member
• Set-UnifiedGroup -Id "O365 Group" -HiddenFromAddressListsEnabled $false was run
• WARNING: The command completed successfully but no settings of
  'O365 Group_*****************-****-*******' have been modified.
• This leads me to believe that the group should be visible in GAL.
• I can find and add the group, with a successful join reported by Outlook.
• When I close and reopen Outlook the group is gone.

This is not happening with Groups created in Exchange after migration. Help, please.

[#2 · Accepted solution]

Try removing and readding yourself as a member from the group via admin center, then try the join again via outlook.

[#3]

@harveer singh Thanks that worked