Embedded PowerApps Security Sign In

Hope someone can point me in the right direction.   I have a Power BI report with an  embedded PowerApp that has been working fine until today.  It's a very simple app that takes data from the Power BI report and sends it as an email on the press of a button.  The only thing showing in the app is the button.

I updated my iOS (to 12.2) yesterday and now when I open the report on my iPhone the button is replaced by the message "For security reasons, we need you to sign in once more.".  It has a button beneath it that when pressed presents this message "Pop-up blocked - please disable any pop-up blockers to sign in."

I had to sign in again when I first opened the report on my iPhone so obviously I lost my cached ID/password with the iOS upgrade.  But I've gone to all three of the browsers and disabled the pop up blocker with no luck.

I opened the report in Power BI desktop and saw the same message in the app there as well.  But here it allowed me to log in and see the correct button.  So I saved the report and republished it.  Unfortunately that didn't help.  I've closed the app on my phone to force a refresh of the report and still no luck.  Shut down the phone - no luck

I opened Power BI from my browser on my phone and pulled up the report and could see the button.  But of course that was showing the desktop version and not the iPhone view as it does when I open the report using the Power BI app.

Any suggestions would be greatly appreciated.  Thanks.