Hi there
I can't edit the Account column directly on the Contacts table:

If I create a new Contact in Power Pages Management, it allows me to select the Account Name but it then populates the Company Name column:

If I create an invitation in Power Pages Management, it allows me to select the Account Name but it then populates the Company Name column:

Since the assignment of a Contact to an Account is an important part of security, it seems very strange that it is so hard to do this.
Any thoughts?