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Error when using Deepl's API

I've signed with Deepl Pro, got the Api key and put it into the MT Services Preferences. But, whenever I try the following message appears in the Deepl MT pane:

"Authorization failed. Please supply a valid authorization key parameter."

Please, anybody could help me understand what I did wrong?


By the way, what is the minimum Deepl paid account that I should buy in order to use Deepl API? Maybe I am a bit confused here.


Please check DeepL plans here:

Unless they changed something, CAT Tool integration starts from the Advanced plan. It looks a bit confusing indeed.

Which means approximately 30 USD a month. I think I'll pass. (I'll keep using Deepl manually from inside CTE.)

But thank you.

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