Problem/Motivation

I have set up everything correctly for my Facebook and Youtube login feature,
However, when trying to register as a new user, the popup is shown, the user is verified and then I'm taken back to the site and nothing happens. No new user account is created.
On my one-all dashboard I see that a user has been "registered", even the name of the person is shown correctly, however, on Drupal, there is no user created.
Am I missing something here?

My system: Drupal 8.9.13, Nginx 1.18.0, PHP 7.3.21, MySQL 8.022, I use Cloudflare for HTTPS rewrites. I am behind a reverse proxy
API communication: PHP cURL library over Port 443/HTTPS (maybe I should change to Port 80/HTTP? I haven't tested that yet.)
API settings verify OK
Also, the social network settings test on the OneALL dashboard verify OK

The logs show no errors.
These are the lines from my Nginx access log:
10.10.0.253 - - [24/Jan/2021:22:44:41 +0100] "GET /social_login/callback?origin=http%3A//dev.ubuntufmartists.com/user/register HTTP/1.1" 302 261 "http://ubuntufmartists.api.oneall.com/socialize/redirect.html?provider_c..." "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/14.0.2 Safari/605.1.15"
10.10.0.253 - - [24/Jan/2021:22:44:41 +0100] "GET / HTTP/1.1" 200 33559 "http://ubuntufmartists.api.oneall.com/socialize/redirect.html?provider_c..." "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/14.0.2 Safari/605.1.15"

Steps to reproduce

Try it yourself at https:dev.ubuntufmartists.com

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes

Comments

ph7 created an issue.