Plugin causes admin panel to throw 500 error

Hi,

What is logged in your PHP error log at the time?

The plugin doesn’t have any hooks into the admin area generally, so the most likely cause is that your site is running very close to the configured hosting PHP memory limit, and that one more plugin tipped it over. But not necessarily. Can you post in the support forum? https://wordpress.org/support/plugin/two-factor-authentication/

David