Hi,
When I add new user, they don't receive invitation email.
Hi @Usman Sheikh and welcome to the Community,
are you sure, that the "send email" check box was ticked?
Did you invite a managed user or an external one?
Hi Usman - Welcome to the Atlassian Community!
You should open a support ticket with Atlassian to see if the email address is on the Suppression list.
https://support.atlassian.com/contact/#/
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