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We have an issue with a new Magento 2.4.2 site after migrating from M1 and activating 2 Factor Authentication. The QR code will not load and just displays as a broken image.

Magento 2 Factor Authenticaion Image

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    Any One found the solution ? Nov 9, 2021 at 10:30
  • Anyone have a legit. answer for this?
    – gnicko
    Dec 14, 2021 at 11:25

1 Answer 1

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This turned out to be caused by an erroneous newline being added to all output. If you inspect the page source (right click => view source) on any page and you see this, then you have the same issue.

view source example

To find the offending file we used Magento's coding standards with PHP_CoderSniffer

magento@12389-php-fpm:~/htdocs$ ./vendor/bin/phpcs --standard=Magento2 app

FILE: /app/path/to/file.php
------------------------------------------------------------------------------------
FOUND 1 ERROR AND 2 WARNINGS AFFECTING 3 LINES
------------------------------------------------------------------------------------
 2 | ERROR   | [ ] The opening PHP tag must be the first content in the file
------------------------------------------------------------------------------------
PHPCBF CAN FIX THE 2 MARKED SNIFF VIOLATIONS AUTOMATICALLY
------------------------------------------------------------------------------------

Unfortunately CodeSniifer was unable to fix the file automatically, but it was a case of changing

  
<?php

to

<?php

Then flushing cache.

N.B if the above doesn't find an error for you, you may need to also check vendor, though fixing an issue with a module in vendor would require assistance from the vendor or a patch.

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