Microsoft Team AadSync added you to the team .... while they were already member

Question

Microsoft Team AadSync added you to the team .... while they were already member

Hardloper123 296

Hi,
In our organisation mulitple users get notifications from Teams they have been added to a Teams channel, while they were already a member of this channel.

What's cause of this and how can it be prevented?
Finally AadSync is neither an AD account nor a cloud account, so what is it?

JimmyYang-MSFT 58,776 Reputation points Moderator

2022-03-24T08:11:45.527+00:00

Hi @Hardloper123

Is this account "AadSync " your internal user in your organizations?

Do you have the same problem in your organization?

To disable the notification in Teams client, it recommends you try to disable the channel notification by following the picture below:
JimmyYang-MSFT 58,776 Reputation points Moderator

2022-03-28T10:04:12.803+00:00

@Hardloper123

It has been a while, how is everything going?
If you have any update about this issue, please feel free to post back.

3 answers

Your answer

JimmyYang-MSFT 58,776 Reputation points Moderator

2022-03-24T08:11:45.527+00:00

Hi @Hardloper123

Is this account "AadSync " your internal user in your organizations?

Do you have the same problem in your organization?

To disable the notification in Teams client, it recommends you try to disable the channel notification by following the picture below:
JimmyYang-MSFT 58,776 Reputation points Moderator

2022-03-28T10:04:12.803+00:00

@Hardloper123

It has been a while, how is everything going?
If you have any update about this issue, please feel free to post back.

Answer 1

Michel de Rooij 1,546 MVP

Microsoft Teams Aadsync will add individual members of a security/m365 group when you add that group to a Team. The group will not be added as a member, only its members, and at addition-time only. It could be that when adding groups, its members are already a member, in which case you can ignore this redundant default notification message.

Irene Lappalainen 1 Reputation point

2022-05-19T05:06:25.59+00:00

Multiple users are now getting these very confusing notifications. These users are already members of the team and nobody has changed the teams member settings => nobody has added or removed members or added security groups to those teams. Audit logs did not help since there is this same information "teams aadsync added or removed xx user". Also one user was REMOVED from the team by this Teams AadSync and did not get membership back until was added back manually by the owner.

These notifications and actions by Teams AadSync are now raising security concerns because we cant explain why this is happening and nobody has actually changed the team memberships.

Answer 2

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Answer 3

Hardloper123 296

Hello,

It took a while but the solution for us was to set up Modern Authentication via Microsoft 365 Admin Center in addition to Conditional Access which was already set up before. As a result, certain accounts were no longer randomly locked from the outside and therefore will not be re-signed in Teams channel..

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Microsoft Team AadSync added you to the team .... while they were already member

3 answers

Your answer