Error when joining kubuntu 20.04 to AD

I tried some different capitalization and domain combinations with the other account that I used to join the Windows 10 box, and I received different errors. I tried the following 3:

name @DOMAIN.COM
name @domain.com
name

Here are the different errors I received:

name @DOMAIN.COM

  • Wrote out krb5.conf snippet to /var/cache/realmd/adcli-krb5-ZqvLtZ/krb5.d/adcli-krb5-conf-a7sKNY
    ! Couldn’t authenticate as: name @DOMAIN.COM: Preauthentication failed
    adcli: couldn’t connect to domain. com domain: Couldn’t authenticate as: name @DOMAIN.COM: Preauthentication failed
    ! Failed to join the domain
    realm: Couldn’t join realm: Failed to join the domain

name @domain.com

  • Wrote out krb5.conf snippet to /var/cache/realmd/adcli-krb5-YnftAM/krb5.d/adcli-krb5-conf-KBUBpL
    ! Couldn’t get kerberos ticket for: name @domain.com: KDC reply did not match expectations
    adcli: couldn’t connect to domain .com domain: Couldn’t get kerberos ticket for: name @domain.com: KDC reply did not match expectatio
    ! Failed to join the domain
    realm: Couldn’t join realm: Failed to join the domain

name

  • Wrote out krb5.conf snippet to /var/cache/realmd/adcli-krb5-PnPc1X/krb5.d/adcli-krb5-conf-hcWKfY
  • Authenticated as user: name @DOMAIN.COM
    ! Couldn’t authenticate to active directory: SASL(-1): generic failure: GSSAPI Error: Unspecified GSS failure. Minor code may provi
    adcli: couldn’t connect to domain .com domain: Couldn’t authenticate to active directory: SASL(-1): generic failure: GSSAPI Error: Unsp
    ! Insufficient permissions to join the domain
    realm: Couldn’t join realm: Insufficient permissions to join the domain