Site Access error, admin cannot send invitations to company members.

Steps to recreate:

1. Go to: Customers>Companies>Select/create a company
2. In Invitations tab select Invite member
3. Fill in email address, click Send
4. You will get an error.

Error: Current SiteAccess is not a part of `corporate_group` [in vendor/ibexa/corporate-account/src/lib/Form/Processor/InvitationsFormProcessor.php:152]