Hi,
What the version number of Office 2019 did you use?
This feature is available to Microsoft 365 subscribers and Office 2021 or 2019 customers using Version 1710 or higher of Word; or Version 1803 or higher of PowerPoint or Excel. You must also be connected to the internet, and have Office connected experiences enabled to use Translator.
First I suggest you go to File- Account and check the version number you're using:
Then I suggest you go to File- Options- Trust Center- Trust Center Settings...- Privacy Settings...- check the option "Trun on optional connected experiences":
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