Colleague can't query SSISDB - sql-server

Question

I'm trying to grant access to a colleague to allow them to query on SSISDB package errors.
I've given them access to the database (SSISDB) with db_datareader. Under Logins > Properties > User Mapping.
The query executes fine for my colleague, but produces no results.
n.b. not my query, stumbled across this online a while ago. But gives me good results.
USE SSISDB;
GO
SELECT TOP 1000 [execution_id]
,[folder_name]
,[project_name]
,ex.[package_name]
,MESSAGE
,[project_lsn]
,[executed_as_name]
,[use32bitruntime]
,[status]
,CASE [status]
WHEN 1 THEN 'Created'
WHEN 2 THEN 'Running'
WHEN 3 THEN 'Canceled'
WHEN 4 THEN 'Failed'
WHEN 5 THEN 'Pending'
WHEN 6 THEN 'Ended unexpectedly'
WHEN 7 THEN 'Succeeded'
WHEN 8 THEN 'Stopping'
WHEN 9 THEN 'Completed'
ELSE 'ADDITIONAL VALUE - PLEASE CHECK CASE STATEMENT'
END StatusDescription
,[start_time]
,[end_time]
,[caller_name]
,[process_id]
,[stopped_by_sid]
,[stopped_by_name]
,[server_name]
FROM [SSISDB].[catalog].[executions] ex
LEFT OUTER JOIN SSISDB.catalog.event_messages em
ON em.operation_id = ex.execution_id
AND event_name NOT LIKE '%Validate%'
AND MESSAGE LIKE '%An error occurred%'
where start_time > GETDATE() - 7 --last weeks errors
AND status not in (2, 7, 9)
order by [execution_id] desc
When I run this, I am given a list of failed SSIS packages and the errors messages. However, when my colleague runs this - the output is blank.
Any help much appreciated.

Answer 1

I got around this by adding the user into the ssis_admin role.

Answer 2

This is because of a special database role: ssis_admin
USE [SSISDB]
ALTER ROLE [ssis_admin] ADD MEMBER [login_used_to_query_data]

Answer 3

There other SSIS level permission which we need to give to check if all those are working.
And use the below one and check if this helps
1- Run Dcomcnfg.exe. ...
2- In the Component Services dialog, expand the Component Services > Computers > My Computer > DCOM Config node.
3- Right-click Microsoft SQL Server Integration Services 13.0, and then click Properties.