Lukáš Pezl I'm glad that your issue is resolved and thank you for posting your solution so that others experiencing the same thing can easily reference this!
Since the Microsoft Q&A community has a policy that the question author cannot accept their own answer, they can only accept answers by others, I'll repost your solution in case you'd like to Accept the answer.
Error Message:
If I try to ask something in the OpenAI Stuido chat I always get an error: Error
The completion call failed. Repeat the action
Also, If i try to connect and ask with Python, I get this error:
ConnectError: [Errno 11001] getaddrinfo failed
Solution:
it was a firewall / VPN problem on company network.
If you have any other questions, please let me know. Thank you again for your time and patience throughout this issue.