Creating subtask in different project

[Lex Dernison]

Good day all,

I'm really hoping someone could assist me with below or point me to where I can learn on how to do this. I'm really having a hard time understanding Jira.

So my scenario:

We have three projects:
Project 1: management
Project 2: member group 1
Project 3: member group 2

I'm in Project 1 and I get a task assigned, for example: "Send inventory" 
I want to create a subtask that I can assign to all members in project 2 and project 3. 

At this point when I'm creating a subtask of my task, I cannot change the project as the dropdown menu is grayed out. Secondly when I'm looking at assignee, I can see users of project 2/3 but I can only select one at the time.

[Jakub Mirovsky]

I have exactly the same problem. When I try to login with email I register with, it tells me that I need to use cloud username which I can find in welcome email. 

But there is no such thing in welcome email. 

Such a disapointment.

[teilor_soares]

Is this a Server installation of JIRA or a Cloud instance. If is a server instance, you probably defined a admin user and account when running the Setup Wizard or, choose the option to let JIRA make all settings for you and the user and password would be the same as the one of your MyAtlassian account.

Anyway, you can retrieve your password following the instructions in the link below:

https://confluence.atlassian.com/display/JIRA/Retrieving+the+JIRA+Administrator

Cheers!
Teilor