User Lyokoï (note the diaeresis on the i) can't use his Wikimedia account to register on Phabricator. The reason given aren't detailing if diacritics are allowed (latin characters are supposed to include diacritics).
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This does not seem to be about login but about account registration.
Similar to T179126: Clarify that spaces are not allowed in Phabricator usernames when creating an account.
We could adjust the translation.override section in https://phabricator.wikimedia.org/source/operations-puppet/browse/production/modules/phabricator/data/fixed_settings.yaml but not sure how to improve... "ASCII" is probably a term most people have never heard of.
The expected outcome from this user would be to be allowed to use his username, not to have a better message. :)
I used log-in, since this happen when you click on the following button that is supposed to use OAuth to connect you smoothly.
For the context: this user action was to log-in on the Space.
If the intention is to support non-ASCII letters than this is a duplicate of declined T375: Aligning Phabricator account restrictions with Wikimedia's.
See https://secure.phabricator.com/T6003 for the reasons.