"Follow" missing from sites for External Users #EXT#

Hi,

Paul thanks for the response, I came to a similar conclusion. However, I assumed that as I could allocate the external log on account an Office 365 licence that somehow a OneDrive area and email would be created for that account.  Then from that point, they would be able to follow documents and sites. 

I am back to square one where I need an external group of users, who exist in their own tenancy to have access to a secondary collaborative SharePoint site in a new tenancy.  

I started with the user-initiated guest invitation model (https://support.office.com/en-gb/article/Planning-SharePoint-Online-business-to-business-B2B-extranet-sites-d29c9b70-5fdb-4fa0-84a8-6bd03b7517d8), but following the links within the document and further searches does not provide me with a definitive answer of what external users will and won't be able to do. 

Hopefully, I will receive another response or link to an article that points me in the right direction.

Kind regards

Dan