Since we started using Jira, we never faced this kind of issue.
But recently, we created a new e-mail box (in Microsoft 365), and a friendly company tried to add this user to his Jira, but it failed.
For some reason, no emails (from Atlassian) come to the affected user, and the user cannot log in, reset the password, etc.
Affected Jira: [hidded]
Affected email box: [hidded]
From my side: no blockers, rules, quarantine, etc. (that may cause this issue) is not set up.
More than that, other *@[hidded].com users may receive emails from different Jira servers. But only the affected user is not.
What are the next steps here?