Is it possible to add external Jira users to one of my Jira Groups without creating a new user?

[Afonso Marques]

One of our suppliers is also using Jira, let us call it Company A.

I would like to add one email from Company A to one of our Jira Groups.

[Joe Pitt]

To add someone they need to have a user ID unless you make the project open to anyone, and I don't think that is what you want from your message

[Afonso Marques]

OK.

Where can I get that from in order to tell them what to fetch?

Once I have their user ID shall I just use it to add the new member?

[Joe Pitt]

I guess I wasn't clear. They need a Jira user id. 

[Afonso Marques]

1. I understood what you said, but I'm the one leading the process and I need to pass onto them some sort of steps on where to get the user ID.

2. Once they provide me their user ID to be added to my group, shall I just paste it, instead of the email address, inside the invitation box when adding a new user to the group?

[Joe Pitt]

I don't know your process for people signing up for Jira. They need to sign up and then send you their name to add to the groups.

[Afonso Marques]

One more time...

I'm in Company B.

Company A works with Company B on project XYZ.

Both companies use Jira.

I would like to add John Smith from Company B to one of my groups in Company A. In other words, 2 companies, 2 domains, 2 Atlassian invoices and John Smith from Company B to join a Jira group of Company A.

Do I need to create an account for John and also pay for it when he is already a Jira user? If not, how do I add him to my group?

[Joe Pitt]

Yes, They are two separate instances so you need an ID in both of them.