This is kind of an old issue, but I have a little more clarification on the issue this time.
I have a number of SG (siteground) accounts.
On one of my SG accounts, I have installed Mainwp under the domain admin.mydomain.com - and from here I want to connect to the sub-domain of another website smp.otherwebsite.com. But that is not possible. I am unable to get any connection.
However, I believe I am on to something here, because I have noticed, that I am able to connect to audio.otherwebsite.com - and I am very sure this is because that otherwebsite.com (primary domain) is hosted on the same SG account as audio.otherwebsite.com - where as smp.otherwebsite.com is NOT hosted on the same account as otherwebsite.com (primary domain)
Do I relly need to collect all my xxx.otherwebsite.com domains on the same account as the primary domain or is there a fix to look forward to in Mainwp?
ps. it is not that I am unable technically to move all sites to the same SG account, but I will run into web space and inodes limitations.