Level 2 Examinations - internal server error

Hello, 
Today, I tried to take the exam for the Trados Studio 2022, Level 2.
Unfortunately, that was impossible, as the following message appeared on the screen.

500 - Internal server error.

There is a problem with the resource you are looking for, and it cannot be displayed.

What also astonished me, was the fact that I saw on the screen that I had only one attempt left, while I was not able to take the exam at all.
I would be grateful if you could let me know how to proceed next, in order to sit the exams. 
Thank you in advance,
Tania Bania 
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