Norton private browser will not let me access Tesco.com

Norton private browser is my default browser. 

Every week I log in to my Tesco home shopping account to create an order. This week it allowed me to enter my user name and password as usual but when I clicked 'sign in', instead of going to the home shopping page it sent me to a page that says 'Oops... It looks like something is not right. If you are seeing this page it is because your browser has failed some security checks.'

Tesco.com will allow me to log on using Microsoft Edge, Google Chrome and Brave browsers, but not Norton Private Browser.  I have not changed any settings since I logged in the previous week.  I phoned Tesco, but they could not help and just told me to use one of the other browsers in future instead of the Norton browser.

I have tried everything I can think of to change norton security settings, removed all the extensions, and even tried accessing Norton.com using the private mode window, all without any success.

Has anyone else experienced this problem and does anyone have any suggestions please.

Thank you.

Oh...okay. 
Sorry, I'm not able to test tesco.com Sign In.  I don't have an account and see Access Denied calling Sign In. 

Access Denied
You don't have permission to access "http: //www. tesco. com/account/login/en-GB?" on this server.
Reference #18.9[...].21efa50a

Thank you for looking.

All Tesco cookies are accepted

Privacy Badger is also disabled for Tesco site.  In fact on Microsoft Edge where the Tesco site does work, Privacy Badger I notice is still enabled.

The blue icon with 168, in Inoreader, which is my newsfeed reader.  This extension is also enabled on the other browsers.

and you accept all tesco.com cookies?
and you allow Ads & trackers via Privacy Guard?

https://www.tesco.com/groceries/en-GB/zone/privacy-and-cookies-policy

Edit:
I see Privacy Guard disabled
Is Privacy Badger disabled? 

what's the blue icon with 168?