When you try search or mention user by Name or Surname you can't search user with foreign language signs in name/surname (user can't add all different keyboard). When users data are taken from domain linked account you can't change the name/surname in Aha too.
Please give possibility to search user by email address. In e-mail address always we have English signs. If user name is Łukasz Źrebełko you can find him as lzre... with easy.
Thank you for the idea. Given the low volume of support for this idea, we do not have plans to make updates in this area at this time.