Issue Summary

On a form created for a JWM Company-managed project, when searching for any given user on a custom field of type User Picker with a User Filtering in place, users can only see a spinning wheel, and no options get displayed.

Steps to Reproduce

1. Have a JWM Company-managed project created.
2. Have a User picker (single user) custom field created, and edit its context to allow only users from a specific group to be picked.
3. Go to the form builder in the JWM project and include that User picker field
4. Open the form and try to populate the field you just created.

Expected Results

1. Field suggests users from the group that you have selected

Actual Results

1. The field does not suggest anything and just spins
   • In the background, we can see the request GET /rest/api/3/user/recommend?context=CustomUserField&fieldId=customfield_xxx&query=yyy resulting in a 400 error

     {"errorMessages":["Provide a valid project ID or project key"],"errors":{}}

Workaround

At this moment, the workaround available is to remove the current user filtering configured on the custom field context and have the users search for the desired user against the active users in the system instead of the group.