Group Access denied even though I'm Company administrator and the group is shared with me

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Hi guys,

I'm a Company administrator and I can't access a group that was created by another Company administrator, even though he gave me access and full controll. In his console it clearly states under permissions that I have "Full Control". Yet I can't share it.


Can anyone explain what we need to do to give me full permissions to manage this group?


Many thanks and best regards,

Milo