https://www.theguardian.com/money/2022/jul/25/wizz-air-technical-glitch-check-in-online-pay

We couldn’t check in online so had to pay to use the airline’s desk

On 27 June my partner and I were booked on a 7.55am Wizz Air flight from Gatwick to Athens. On the Saturday before, I received an email telling me to check in online.