I’m surprised there’s no question about it yet:
Which special characters can be used for entering passwords? Where can I find more information?
So far I have found out that the following characters do not work:
Space
Underscore _
if you can’t find a documentation on this then i think you could ask the maintainers of the documentation for such one. From what i know they can be reached via https://github.com/owncloud/documentation/issues
Hey, nice. And i just have seen in there and linking it below so others can find it immediately. Hope you will get some answers or even an updated / enhanced documentation about that.