Thank you for such a speedy response. I will test his in the morning

I have tested this item ✅ successfully on 550ddf2

Before patch: No QR code.
After patch: QR code created.

I could not test if QR code is scannable and/or correct. Decide yourself if that's a successful test!

For my own reference when it comes to J4 the library is https://github.com/kazuhikoarase/qrcode-generator/blob/master/js/package.json#L2

thx

I installed 3.9.5 but the fix for the QR-Code for 2FA still does not work on my Joomla installation. Do I have do to something special to get it working again?

@deroderuiter strange I tested it again and it works for me, do you have a screenshot and could you create a new issue.

There is not much to show. In edit profile I choose the tab Two Factor Authentication, I scan the QR code with the Google Authenticator App on my smartphone and fill in the code and save the page. No error is displayed but the tow factor authentication is not activated.

I saw I remark of Phil Taylor that Google no longer provides a chart API for QR Code. It was actually deprecated in 2012 and turned off Completely on March 18,2019
My English i not so good and I don't know if I understood this correctly and if it is correct it could explain why 2FA doesn't work anymore.

if you see the qr code then the issue you refer to above is resolved as the qr code has been generated by different code

So probably I have an other problem?