Uniper Junior Data Science and Modelling Engineer interview questions

I applied on their home website and got feedback quickly, within 4 days. Then an online interview was arranged via Microsoft Teams. However, the interviewer didn't show up. I was waiting whole time to get approval into the room. I sent an email immediately to confirm the time but this was an dead end. No phone call received. One hour later, the interviewer sent email about my absence. He illiterately replied that he texted in chat box. Obviously, I couldn't read anytime without being able to enter the room. It was extremely disappointing, and a waste of time. Reflection: I should try the call in (audio only) feature, which I did not have such idea back then.