Email button will only share, won't email

There is an envelop icon in the top left of my toolbar when I open a PDF in Internet Explorer and click the Adobe icon.

When I click this icon it used to give me e-mail options.  Now it gives me sharing options.

When I 'Invite People' and try to send the document I get a pop-up to sign in.

I never had to sign in before to send a document thru mail.

If I try to "send as attachment" I can click the continue button but nothing happens.

What setting or function am I missing?  I just want to send the file as an email attachment.

As a bit of feedback, this whole process seems to have just gotten more complicated then it needed to be.  Not sure why emailing had to stop being a 'one and done' button click.