Hello,
I’m posting in the hope that someone with a similar issue reads this and finds it useful:
PROBLEM:
After installing the TOTP Second-factor Auth App from the ownCloud Market, and ticking the box at Security > Activate TOTP, nothing happens - no QR code or anything shows up.
SOLUTION:
The app requires the imagick extension to work. Without it, you can’t see the QR code you are supposed to scan.
To install imagick on Ubuntu / Debian / Raspberry Pi OS:
Follow the instructions at linux capable or copy/paste (at your own risk):
Install:
sudo apt install php-imagick
Verify installation:
php -m | grep imagick
Expected output:
imagick
Have a nice day! 