To use Matrix IDs from a given domain, that domain needs to be authorized. We would like to use foundation.wikimedia.org for the Foundation's internal Matrix deployment. Can you please set up https://foundation.wikimedia.org/.well-known/matrix/server to return the following JSON object:
{ "m.server": "wikimediafoundation.ems.host:443" }
As discussed on IRC, we would prefer to use DNS if possible. I haven't heard back from the vendor on this yet, but I will update this task when I do.
Thanks for your help,
Brendan