Hello, I have an issue :
To manage the access rights of a backlog A, we use the distribution lists (those accessible in Outlook). We've been using this for a while now.
The list works but sometimes, some individuals on the list do not have access unlike the members of the list : Mr. X and Mrs. Y are both on the "FCT IS-IT" list which allows “project team” rights in the backlog. They both have active JIRA licenses.
However, only X has access to the backlog, not Y.

It's not a JIRA license issue, nor a legal issue, nor the fact that it's a list of lists (we cut it out).
Do you know why it doesn't work for some people while all settings are fine for others?
Thanking you in advance.