DeepL has changed their authenticating method and we need to adapt WF Pro to it. We expect a mid-April delivery date for the update.
Until WFP is patched, we offer you a free access to DeepL via a server that we set up. It's on us. You only have to connect to a "Remote TM". It's rather simple, here are the steps:

The above is valid for any combination of two of the following languages:
en, fr, it, de, es, pt, nl, da, no, sv, fi, el, hr, hu, ro, mk, bg, lt, lv, pl, sq, sk, ga, ja, ko, zh, ar, he, cs
If the above does not work for you, please try the following options: