Attempt to change NS for the domain fails:
Name Servers update was failed. Can not modify name servers due to unable to set cookie with OpenSRS server. OpenSRS response:  Authentication Error. For support regarding <domain name>, please contact your reseller, <Vendor name> via the following: <Vendors contact Details>. This company may be contacted for domain login/passwords, DNS/Nameserver changes, and general domain support questions.
The external domain data is missing or incorrect. On the domain registration through BA a specific domain data is received from the registrar and is inserted to DomainExtData table. In case of missing data it means the subscription has been created manually with API or sales order was completed with the domain conflict resolver.
Check the domain additional data: Home> Services> Domains> Domain #ID name.tld > Additional Information
There should be the parameters DomainID, Login, Password
If that is missing or incorrect, update it with DomainExtDataAdd_API call. Note, the correct parameterID for Password is