DeepL API 403

[seadhna]

Hi there,
I was able to use DeepL API translation but it doesn't seem to be working anymore, I have tested on several Elxis installations on different hosts.
I get a 403 authentication error.
I have tried with valid FREE and PRO API keys, but the same error. Google translate and MyMemory are working.
I'm wondering if anyone else has had the same problem, maybe something has changed on the DeepL side?