@dominikconrads, it is nice that it works for you.
But all other still have the issue, so i would say apple should test that, and bring a solution.
In my case, we have sophos utm 9 in our company, and on all updated iphones and ipads
L2TP doesn't work anymore.
BR
Frank
Frank-ME81
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I have the same issue on iPad 2018 with IPadOS 14