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How to prevent users from Joining Private groups without invite

%3CLINGO-SUB%20id%3D%22lingo-sub-801515%22%20slang%3D%22en-US%22%3EHow%20to%20prevent%20users%20from%20Joining%20Private%20groups%20without%20invite%3C%2FLINGO-SUB%3E%3CLINGO-BODY%20id%3D%22lingo-body-801515%22%20slang%3D%22en-US%22%3E%3CP%3ERecently%20we%20noticed%20that%20user%20in%20our%20tenant%20are%20able%20to%20join%20private%20Teams%20channels%20with%20out%20an%20invite%20to%20join%20the%20private%20groups%2Fchannel.%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3CP%3EI%20am%20trying%20to%26nbsp%3Binvestigate%20how%20this%20was%20possible%20and%20i%20am%20unable%20to%20reproduce%20the%20problem.%26nbsp%3B%26nbsp%3B%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3CP%3EHas%20anyone%20notice%20this%20behavior%20in%20your%20tenant.%26nbsp%3B%26nbsp%3B%3C%2FP%3E%3CP%3EAny%20suggestions%20on%20how%20to%20find%20out%20how%20the%20users%20where%20able%20to%20join%20%3F%26nbsp%3B%3C%2FP%3E%3C%2FLINGO-BODY%3E%3CLINGO-LABS%20id%3D%22lingo-labs-801515%22%20slang%3D%22en-US%22%3E%3CLINGO-LABEL%3EO365%20groups%3C%2FLINGO-LABEL%3E%3CLINGO-LABEL%3ETeams%20channel%3C%2FLINGO-LABEL%3E%3C%2FLINGO-LABS%3E%3CLINGO-SUB%20id%3D%22lingo-sub-801835%22%20slang%3D%22en-US%22%3ERe%3A%20How%20to%20prevent%20users%20from%20Joining%20Private%20groups%20without%20invite%3C%2FLINGO-SUB%3E%3CLINGO-BODY%20id%3D%22lingo-body-801835%22%20slang%3D%22en-US%22%3ECheck%20your%20audit%20logs.%20Most%20likely%20someone%20added%20them%20to%20the%20Team%20because%20they%20linked%20them%20to%20a%20file%20in%20underlying%20SharePoint%20and%20an%20owner%20added%20to%20the%20group%20or%20also%20there%20is%20new%20access%20requests%20basically%20for%20accessing%20a%20Team%20if%20you%20have%20a%20link%20to%20that%20Team%20but%20in%20both%20case%20someone%20has%20to%20approve%20it.%3C%2FLINGO-BODY%3E%3CLINGO-SUB%20id%3D%22lingo-sub-802196%22%20slang%3D%22en-US%22%3ERe%3A%20How%20to%20prevent%20users%20from%20Joining%20Private%20groups%20without%20invite%3C%2FLINGO-SUB%3E%3CLINGO-BODY%20id%3D%22lingo-body-802196%22%20slang%3D%22en-US%22%3EAgree%20here%2C%20there%20is%20not%20other%20way%20to%20join%20a%20private%20Team%20that%20being%20added%20%2Fapproved%20by%20an%20Owner%3C%2FLINGO-BODY%3E
jean090681
Occasional Contributor

Recently we noticed that user in our tenant are able to join private Teams channels with out an invite to join the private groups/channel.

 

I am trying to investigate how this was possible and i am unable to reproduce the problem.  

 

Has anyone notice this behavior in your tenant.  

Any suggestions on how to find out how the users where able to join ? 

2 Replies
Check your audit logs. Most likely someone added them to the Team because they linked them to a file in underlying SharePoint and an owner added to the group or also there is new access requests basically for accessing a Team if you have a link to that Team but in both case someone has to approve it.
Agree here, there is not other way to join a private Team that being added /approved by an Owner
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