Secure embedded report login not working on some browsers (windows chrome)

I have created a secure embedded report as specified below:
https://powerbi.microsoft.com/en-us/blog/easily-embed-secure-power-bi-reports-in-your-internal-portals-or-websites/

I created this in an html page using the supplied iframe.
It works fine on windows firefox and edge.  It does not work in windows chrome.
It works fine on mac chrome.  It does not work on mac safari.

It fails on windows chrome after opening a new tab and asking for the login details, this tab then closes and the power BI symbol in the embedded report just flashes like it is loading but it never finishes.
On Mac safari the login fails.  It looks like it gets caught in a loop of some kind.

I just want it working on windows chrome really.

I have tried clearing my complete browser cache and cookies and rebooting serveral times with no luck.
It does not make a difference if I select "remember me" or not at the time of login.
I have the latest version of chrome.

Any help appreciated! 

EDIT:

Here is the embedded report.  You won't be able to access it but it may give you an idea of the issue:

https://fir-trial-66e3f.firebaseapp.com/embedded-report.html

There is a chance it may be related to this issue.  Also a log in problem with this account:

https://community.powerbi.com/t5/Community-Feedback/I-can-t-log-into-Power-BI-Community-https-community-powerbi-com/m-p/848242#M1788