@Antonio Martinez I have tried a scenario to translate dutch to spanish using the Azure translate API and it seems to work as expected.
I think the issue could be related to the wordfast pro plugin which utilizes the Azure translate API but fails to display the actual output. Could you please check if the translation works directly with the Azure API as shown in this screen shot?
You could also consider contacting wordfast pro support team to check if the translation actually works directly with the Azure API. Thanks!!
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