I bought some other coins on safe.trade.
they have kind of withdraw-limit.
if your withdraw is above that limit it gets locked and you have to send them a message -- I did it via discord.
they have very fast and very good support. its just kind of safety-feature.
Must be a very low limit. I barely bought any. I'll try finding a way to contact them since I don't see any way to do it through their site. Thanks.
Update: I found where I can submit a support ticket at
https://support.safe.trade