DeepL plugin is not working in SDL Trados 2021

I have downloaded and installed the DeepL plug-in.

I followed step-by-step the instructions How can I use DeepL Pro in SDL Trados Studio 2019? (cf. https://www.deepl.com/en/pro-tool_integration.html)

At the end of the process, SDL Trados 2021 tells me that the translation provider DeepL Translation Provider does not support any language pairs and I get the following message.

See below

 

In that message, it advises me to use the Any TM (Add any TM).

When I choose this option, DeepL appears in the TMs but is n/a and the TM does not propose translations for the segments.

In conclusion, how can I make the API work? DeepL is not working for me.