My guess is that you have multiple Azure AD groups that share the same displayName, haven't you?
As per Atlassian's documentation
In Azure AD, you can have multiple groups with the same name (displayName), but it's not supported in Crowd and results in a failing synchronization. Make sure you change your Azure AD group names to unique ones.
Two vulnerabilities have been published for Confluence Server and Data Center recently: March 20, 2019 CVE-2019-3395 / CVE-2019-3396 April 17, 2019 CVE-2019-3398 The goal of this article is...
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