I have an LDAP login name that is longer then 20 characters and Hub fails to fetch my full name and email from the LDAP

Active Directory has a 20 characters limit for the field sAMAccountName.

By default, Hub uses filter "SAMAccountName=%u" to resolve users by what they have entered in the login form. If there are users at your LDAP server with sAMAccountNames longer then 20 characters, then it's better to use a different field in the filter, for example "userPrincipalName=%u@your.domain".