Hi, in my testing of this, I set my label as below,


Screenshot 2020-06-20 at 12.33.47.png


Then I created a SPO Team site with this sensitivity label applied to it. I created a word doc and was able to share it to an external Gmail account (completely new test Gmail account).


However, when opening it, I was challenged to send a verification code to the Gmail account.  


Screenshot 2020-06-20 at 12.34.37.png

The code never arrives.  Have tried resending it a number of times.  I believe this is probably going to be the expected behaviour.  What I might do is leave it a while and see if anything changes.  Then I will add the Gmail account as a guest user and see if that changes anything.