Query RTC work items with a certain tag programmatically

I am trying to create and run a query in order to find all work items in a specific project area that has a specific tag.
For that I am using the following code:
ITeamRepository repo = (ITeamRepository) prjArea.getOrigin();
IAuditableCommon auditableCommon = (IAuditableCommon) repo.getClientLibrary(IAuditableCommon.class);
IQueryableAttributeFactory factory = QueryableAttributes.getFactory(IWorkItem.ITEM_TYPE);
IQueryableAttribute attributeTags =
factory.findAttribute(prjArea, IWorkItem.TAGS_PROPERTY, auditableCommon, monitor);
Expression hasTag = new AttributeExpression(attributeTags, AttributeOperation.CONTAINS, TAG_NAME);
Term term = new Term(Operator.AND);
term.add(hasTag);
IQueryClient queryClient = (IQueryClient) repo.getClientLibrary(IQueryClient.class);
IQueryResult<IResolvedResult<IWorkItem>> queryResult =
queryClient.getResolvedExpressionResults(prjArea, term, IWorkItem.FULL_PROFILE);
List<IWorkItem> workItems = new ArrayList<IWorkItem>(queryResult.getResultSize(monitor).getTotalAvailable());
The resulting list is empty although it should return one work item. (I tested with a manually created query).
What am I missing here?
Thank you
For that I am using the following code:
ITeamRepository repo = (ITeamRepository) prjArea.getOrigin();
IAuditableCommon auditableCommon = (IAuditableCommon) repo.getClientLibrary(IAuditableCommon.class);
IQueryableAttributeFactory factory = QueryableAttributes.getFactory(IWorkItem.ITEM_TYPE);
IQueryableAttribute attributeTags =
factory.findAttribute(prjArea, IWorkItem.TAGS_PROPERTY, auditableCommon, monitor);
Expression hasTag = new AttributeExpression(attributeTags, AttributeOperation.CONTAINS, TAG_NAME);
Term term = new Term(Operator.AND);
term.add(hasTag);
IQueryClient queryClient = (IQueryClient) repo.getClientLibrary(IQueryClient.class);
IQueryResult<IResolvedResult<IWorkItem>> queryResult =
queryClient.getResolvedExpressionResults(prjArea, term, IWorkItem.FULL_PROFILE);
List<IWorkItem> workItems = new ArrayList<IWorkItem>(queryResult.getResultSize(monitor).getTotalAvailable());
The resulting list is empty although it should return one work item. (I tested with a manually created query).
What am I missing here?
Thank you