currently the mail text is NOT very business like as it says:
Firstname Surname has invited you to the portal IT Service Desk!
Visit the Portal to create a request and ask for help.
We need to modify this simple message. How to do that?
I believe it's not possible, but many customers are asking for this
There are 2 open issues on Atlassian's side, last update is a bit over a month old:
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