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.
Hi Everyone! My name is Mina and I am on Atlassian’s Ecosystems Marketing team. Our team is focused on our technology partnerships and marketplace apps. One of Atlassian’s partners is Slack, who ...
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