Looking at archive.org there was never much there anyway.
https://web.archive.org/web/20180625194357/https://mycelium-support.zendesk.com/hc/en-us
-Dave
There was a bunch of old documents from what I remember, the wayback simply doesn't crawl many of these pages . I spoke to Giszmo yesterday who said he would reach out to them and he is just being paid part time which is a little odd being he is the lead dev for the wallet with the amount of ICO money just for the wallet they pulled in. (5131 BTC from my memory). Hopefully there is an explanation that comes out of this but its good to be aware and prepared