MATLAB rdth function - error message

I am trying to connect to TRTH via the MATLAB built-in function rdth (username, password). However, I keep getting the following error message : Undefined function or variable 'CredentialsHeaderE' .

My initial thought was that it must be related with the proxy , however, we have tried to solve it together with our IT department but the error is still there. Could you please help? Thanks

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