Creating ICA connections from Wyse S10 terminal

We have a Wyse S10 terminal that we can run an RDP session to our citrix server, but when trying to load an ICA session (server or published app) it just flashes up a grey screen and does not run anything.

Cannot see any error logs on the terminal or the server.

Any ideas what we can check or change to get this working?
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Daniel BorgerConnect With a Mentor Senior Citrix Engineer- CCEECommented:
Check the terminal services configuration for a valid license server.  
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