Problem with grey go-away bird

jcorrie has put up a picture of a grey go-away bird but it isn’t recognised by iSpot.
See Grey go-away-bird, Zimbabwe | Observation | Southern Africa | iSpot Nature
I tried to put in a species that the system would recognise but it would only allow Corythaixoides, not Corythaixoides concolor unless you can also define the subspecies (which I cannot). It seems to be a glitch in the system.

The South African part of the site often seems to want subspecies id’s.

Yes, even for the simplest EU Bird European Barn Swallows | Observation | Southern Africa | iSpot Nature