We tested and successfully registered a test domain that includes umlauted a's. Note that you need to convert the domain name to Punycode:
Thanks for the heads up. We're researching.
do you already have some news on this issue? Can you recommend a work-around, e.g. using some API?
Thank you very much, Scott!
I was able to start the transfer now by entering the Punycode version of the domain name.
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