I was tasked with setting up an account for a user I tried about 4-5 times but never got an email, after browsing the community boards I came across this post
https://community.atlassian.com/t5/Jira-questions/Users-didn-t-receive-account-activation-email/qaq-p/332604
This was the solution given:
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Just want to give you an update / save you from the pain I went through...
There is a KNOWN issue with Atlasssian activation emails. If the FIRST email that Atlassian tries to send gets bounced back it will add that email address to an internal block list, thus making it so they NEVER get the activation email.
Remediation...
Contact Atlasssian / open a bug report, tell them to delete the email from the block list and the user will be able to activate.
Common Causes...
Using automatic provisioning systems, like Okta, where Outlook lags behind in setting up the email.
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Can you help me with this?