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Purview DLP policy not applying to meeting requests sent from MS Teams

Copper Contributor

We have a Purview DLP policy that was originally applied to exchange location and applied to mail enabled security group. The users in these groups get the policy applied successfully and MS Teams meeting invite without classification label gets blocked.

Then we added few more M365 groups to this DLP policy. But the users in these M365 groups are not getting the policy and the MS Teams meeting invite without classification label can still be sent successfully by users in these M365 groups.

I looked at the exchange trace log for invite sent by one of these users and see the invite does not match any DLP rule and is thus sent. For a meeting invite from user in the mail enabled group the rule matches and it is blocked.

Are M365 groups not supported for this type of DLP policy?

What other logs or steps I can take to resolve this?

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