Issue Summary

Adding a JPD user who is a Jira Guest user to a JPD space has a 500 failure.

Steps to Reproduce

1. Take a test user with no access to Jira or JPD at admin.atlassian.com level.
2. Grant the user Jira guest permissions first. (this is important, I was only able to replicate in this order. Then wait a few min, refresh etc.
3. Grant the user JPD creator license
4. Navigate to a space (i tested on a private space), try to add the user.

Expected Results

User can be added

Actual Results

500 Error

{
    "message": "Unable to add guest member role to project. No guest member project role found.",
    "status-code": 500,
    "stack-trace": ""
}  

Workaround

Temporarily remove the guest user access, add the user back to JPD space, this would be successful, then grant the user Jira guest access again.