Solved
Pass expired, while it has been extended by interrail!
I contacted customer service and they provided the following solution.
Are there any people who have come across this, that their automatically extended pass is now casually indicated as expired?
Best answer by rvdborgt
If you have a pass cover number, you can add a pass in your Interrail account and enter a random start date in the future. Or even that you have no start date yet. That should work to make reservations.
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