Hi,
Thank you for writing to Microsoft Community Forums.
I understand that you are facing issues accessing the website. We did repro this on lab PC and found the same issue that you are facing.
Are you able to access the website when you click "OK" on the pop up?
Meanwhile, I suggest you to refer and follow the suggestions mentioned below on how to enable popups for your browser.
Chrome
In Chrome's URL window, highlight the entire web address of the current page, then choose the Copy command from the Edit menu or right-click and choose the Copy command.
Click the icon with three horizontal bars in the upper right side of the browser toolbar.
Click Settings.
Scroll to the bottom of the Settings section and click Show advanced settings... .
In the Privacy section, click Content settings... . The Content settings window appears.
Scroll to the Pop-ups section, and then ensure the Do not allow any site to show pop-ups radio button is selected.
Click Manage exceptions... .
In the Hostname pattern field, choose the Paste command from the Edit menu or right-click and choose the Paste command, and ensure the Behavior dropdown menu is set to Allow.
Click Done.
Close any remaining dialog boxes.
Firefox
In Firefox's URL window, highlight the entire web address of the current page, then choose the Copy command from the Edit menu or right-click and choose the Copy command.
Click the icon with three horizontal bars in the upper right side of the browser toolbar.
Select Options (Windows) or Preferences (OS X).
In the left sidebar, click on the Content icon to display the Content section.
In the Pop-ups section, ensure the Block pop-up windows checkbox is selected, then click the adjacent Exceptions... button.
In the Address of web site: field, choose the Paste command from the Edit menu or right-click and choose the Paste command, and then click Allow.
Click Save Changes.
Close any remaining dialog boxes.
Internet Explorer(Windows)
When a website attempts to launch a new pop-up window, you may see dialog boxes alerting you of pop-up windows that have been blocked. Follow the instructions below to allow pop-up windows on a per-website basis.
In Internet Explorer's Address field, highlight the entire web address of the current page, then right-click and choose the Copy command.
From the Tools menu (the gear icon on the far right), select Internet options. The Internet Options dialog box opens.
Click on the Privacy tab.
Under Pop-up Blocker ensure the Turn on Pop-up Blocker checkbox is checked, and then click Settings. The Pop-up Blocker Settings dialog box opens.
Right-click in the Address of website to allow: field, then choose the Paste command.
Click Add.
Close any remaining dialog boxes.
Edge(Windows 10 only)
Note: Currently Microsoft Edge is not an officially supported web browser for this application.
Microsoft Edge for Windows 10 has no per-website control over blocking pop-up windows. Pop-ups are either blocked, or they are not. To allow pop-ups:
Click the ellipsis icon (...) in the upper right corner of your web browser, and then click Settings.
In the Advanced settings section, click View advanced settings.
In the Block pop-ups section, click the switch to Off. Pop-ups are now allowed.
To block pop-ups once again, click the switch to On.
For more information, please refer to the article mentioned below:
https://kyz.pinellascounty.org/popupblocker.html
Hope it helps.
Vineet Kumar
Microsoft Community – Moderator