LDAP - Active Directory

My version of HedgeDoc is: docker - 1.9.7

What I expected to happen:
Authentication via LDAP / Active Directory

What actually happened:
uncaughtException: Could not determine UUID for LDAP user.

my docker-compose.yml:
- CMD_LDAP_URL=ldap://
- CMD_LDAP_BINDDN=
- CMD_LDAP_BINDCREDENTIALS=
- CMD_LDAP_SEARCHBASE=OU=xxxxxx,DC=yyyyy,DC=de
- CMD_LDAP_SEARCHFILTER=(&(objectcategory=person)(objectclass=user)(|(sAMAccountName={{username}})(mail={{username}})))
- CMD_LDAP_SEARCHATTRIBUTES=displayName, mail
- CMD_LDAP_USERNAMEFIELD=sAMAccountName
- CMD_LDAP_USERIDFIELD=sAMAccountName

What coiuld be wrong?
Thank you

has anyone any idea, what could be wrong?
Thank you…