Hi,
Thank you for posing your problem to Microsoft Q&A forum.
You can select the language and when you click to install it does nothing, does not download the package.
Can you see the language pack under the Preferred languages after you click to install it?
If not, please try the methods in below article to see if you can install the Portuguese (Brazil) Language Pack successfully.
https://github.com/mageplaza/magento-2-portuguese-brazil-language-pack
Best regards,
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