If this doesn’t resolve the issue, you might have to disable the ad blockers that you’ve installed. On the Privacy tab, under the Pop-up Blocker, deselect the Turn on pop-up blocker checkbox.

Click the Tools icon, and then select Internet Options.

Under Permissions, deselect Block pop-up windows or click Exceptions and choose which sites will allow pop-ups.

Select Options, and then select Privacy & Security.

In the top right corner of your screen, click the icon with the three horizontal lines ( ).

Enter the following URL to allow the popup window to open.

Click Pop-ups and redirects and under Allow, click Add.Under Privacy and security, click Site settings.In the top right corner of your screen, click the or icon.You can adjust your browser settings by following these steps: If you don’t see this window, it’s possible your browser settings or a previously installed ad blocker might be preventing it from opening.

When completing your return, you’ll be prompted to click the Sign in to My Account button, which will open a separate window containing the CRA’s My Account login page. The Canada Revenue Agency’s Auto-Fill My Return (AFR) feature is a quick and easy way to download many of your slips right into H&R Block’s tax software. Pop-up/ad blocker is preventing me from using the AFR service

Pop up ad blocker