Guest clicks on roundel then barf

Some more detail - quite hard to debug/replicate becuase this is happening to a guest who is also a member of other O365 tenants - thier usual place of work. And is Swedish!

1) Guest went to the CAF Group Sharepoint and clicked on her photo up in the right most corner and then chose ”My preferences”. 

I thought she meant About Me.  If a normal guest goes to the shared files they dont see thier picture, just the guest email address (using a LIVE account vs my tenant account dslight@iasaoffice.org) and no About Me option.

But she may mean her round picture in the preview of members.  As this user was already signed in (even worse her company uses the Microsoft Online Services Sign-In Assistant ) to her other tenant, then they see thier round picture.   I tried that and got errors from Delve - previously I suspect no one had used Delve on the tenant and it was not setup.  Anyway that doesn't work either:

And when I try the URL directly I get a similar message

And yes, external sharing is ON

NB: a little annoying that in a REPLY, you cannot upload a photo form your computer and only use URL based images