when I initially setup my instance I made separate admin and user accounts for myself. the admin account has 2FA setup and it works correctly.
now, after some additional config, I try to go and setup my non-admin account with token-based 2FA and get the error message above
I also made a new test account with throwaway email. logged in successfully but got the same error when attempting to enable 2FA
any assistance would be appreciated, thank you <3
updated to 2.7.0.beta2, issue persists 
Internal server errors usually means something gets logged in the /logs URL. Can you check that please?
Figured it out! With thanks to this https://github.com/davidshimjs/qrcodejs/issues/52
I finally realized it always happened when the encoded string contained non-US ASCII characters (p.e. á, ñ, í…)
This issue was that my title (the one set at site.com/admin/site_settings/category/required) did indeed contain non-ASCII characters. I guess it was pulling that into the QR code when generating and it choked.
The clue was in site.com/logs and after selecting the most recent log entry, under the info tab, there was a line that read:
RQRCodeCore::QRCodeRunTimeError (code length overflow. (1787 digits > any version capacity))
I’ve deleted my posts containing system information but one also contained my thanks to you for pointing me in the right direction. Much obliged 
Just out of curiosity, how long was the site title?
1787 digits are a lot!
I was using a font trick:
$̵̟̞͎̪͖̞̱̇̋͘ṁ̴̤̞̍́̈́y̵̨̡̟͕̣̠̜̳̳͎̋̃̑̎͘_̴̡̺̉̿͂̍̇f̶͕͋̓͘ơ̸̞̠̰̝̲̐͌̔̒ŗ̸̢̱̘͓̦̟̋̂̄̽́̿̿͌̚ù̵̜̪̲̹̺͈͍͎̮̍́̋̀̄̿̽̚͠m̷̨̖̯̮͎̯̦̗͒͛̇̄̂_̵͇̃̓̊͗̆͑͛͋ņ̸̼͕̫̪̲͙͈̅̽̑̌̑͠ą̸̞͇̦̙̥͚̀m̸̢̛̺͓̲̲̙͉̉͐̽͂͆́̕ê̴̥̣̩̥̇͑͌͒̌͐̕͝
Definitely an edge case, and I’m impressed that the QR library was the only thing it broke.
Okay, so that is a like a 360 bytes long title. Makes sense it could not fit.
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