samba-tool domain join fail

Hi,

I would like to install a Samba DC in a Windows AD environment according to
this document:
https://wiki.samba.org/index.php/Joi...tive_Directory
The system is Debian 10 with Samba 4.12.11 from https://apt.van-belle.nl/ .

The join command:

Code:samba-tool domain join ourdomain.local DC -U" ourdomain\admin" --option="dns
forwarder=208.67.222.222 208.67.220.220" --option="interfaces=lo eth0" -d3I get an error message:
...
Quote:

Failed to apply records: Failed to locally apply remote add of CN=owa (Default Web Site),CN=HTTP,CN=Protocols,CN=OCS1,CN=Servers,CN=Exchange Administrative Group (FYDIBOHF23SPDLT),CN=Administrative Groups,CN=First Organization,CN=Microsoft Exchange,CN=Services,CN=Configuration,DC= ourdomain,DC=local: attribute 'msExchOWATranscodingFileTypes': value 'S:8: .:<GUID=36b83610-396d-4f53-ac03-5eae2fb4677a>;CN=owa (Default Web Site),CN=HTTP,CN=Protocols,CN=OCS1,CN=Servers,CN=Exchange Administrative Group (FYDIBOHF23SPDLT),CN=Administrative Groups,CN=First Organization,CN=Microsoft Exchange,CN=Services,CN=Configuration,DC= ourdomain,DC=local' on 'CN=owa (Default Web Site),CN=HTTP,CN=Protocols,CN=OCS1,CN=Servers,CN=Exchange Administrative Group (FYDIBOHF23SPDLT),CN=Administrative Groups,CN=First Organization,CN=Microsoft Exchange,CN=Services,CN=Configuration,DC= ourdomain,DC=local' provided more than once in ADD object: Operations error Failed to commit objects: WERR_GEN_FAILURE

...

Thank you in advance.

Regards,

Tamas Pisch.