Xray Api : how to unassign test runs using the API ?

[aymon.debroglie]

I'm trying to unassign test runs using the xray graphQL API. 
I'm running the following query on  https://xray.cloud.xpand-it.com/api/v2/graphql

mutation {{
        updateTestRun(id : "{test_run_id}", assigneeId : null) {{
            warnings
        }}
    }}

 But this does not unassign the test runs. I've tried null, "None" , "Unassigned" but nothing works. 
If I put a user_id the update works as expected. 
How could I unassign test runs ? Thanks ! 

[Neil]

Hi @aymon.debroglie. Welcome to the community! You might consider contacting Xray directly for support: https://jira.xpand-it.com/servicedesk/customer/portal/2

[aymon.debroglie]

Hi, I have contacted them as well , If they answer me I'll post their answer here ! 

[aymon.debroglie]

In fact it is not possible to unassign with the API see this feature ticket 
https://jira.getxray.app/browse/XRAYCLOUD-4320