Cannot preview VAT 126 form in order to print it.

I am trying to complete a VAT 126 form but after entering all the details on screen when I get to the stage of previewing the finished form ready for printing the new tab that opens has a 404 error. I have tried multiple times today using 2 different browsers (Chrome and Edge) without success. Has anyone got a fool proof way of printing the VAT 126 form?

Hello.
I have just successfully compeleted and previewed the vat126 form using Edge as the browser.
However at the preview stage I did have to allow pop ups on the browser for it to create the preview on screen.
This was a small message that appears by the web address box.
If the problem persists for yourself after allowing pop ups, try deleting your cookies and temporary internet files to see if that resolves this issue too.

Thanks for the reply. I finally got the VAT126 form to preview and print yesterday using the Edge browser. No changes from the previous session other than a Microsoft update to Edge. Maybe that fixed it. All I need now is HMRC to supply me with the Unique Reference Number they promise so I don't have to resort to printing each time. I'm not too hopeful though as I've been through the VAT126 form process at least 6 times and never got a number.