Perspective Tag History Binding to Internal Historian

Hi,

I have a tag history provider set using the Internal Historian, and it seems to be logging:
Test code:

def browse(path=''):
    for result in system.tag.browseHistoricalTags(path).getResults():
        print result.getPath()
        if result.hasChildren():
            browse(result.getPath())
browse()


endTime = system.date.now()
startTime = system.date.addSeconds(endTime, -30)

data = system.dataset.toPyDataSet(system.tag.queryTagHistory(	paths=['histprov:Historian:/drv:default:/tag:testhistory'], \
																startDate=startTime, \
																endDate=endTime, \
																returnSize=10, \
																aggregationMode="Average", \
																returnFormat='Wide'))

for row in data:
	print 'dt=' + str(row[0]) + ', value=' + str(row[1]) 

Results:

histprov:Historian
histprov:Historian:/drv:default
histprov:Historian:/drv:default:/tag:testhistory
dt=Mon Aug 17 15:22:51 CAT 2020, value=52.2655885295
dt=Mon Aug 17 15:22:54 CAT 2020, value=55.2635878626
dt=Mon Aug 17 15:22:57 CAT 2020, value=53.0305101701
dt=Mon Aug 17 15:23:00 CAT 2020, value=1.26125375125
dt=Mon Aug 17 15:23:03 CAT 2020, value=4.26025341781
...

I cannot seem to get the Tag History binding to return any values:

The above gives the following issue in tags.history.InternalHistorian.Query
image
Is there a different tag path syntax one must use?

Thanks,
Deon