That will create a debug.log file in your /wp-content/ directory which you can examine in any text editor. Try going through the log-in sequence again and then inspect the log. If you don't find the debug.log file it means it didn't generate any warnings or errors.
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OK, I had that back to front.
I tested on my own local site and can confirm the problem.
I noticed the following PHP warnings in the debug.log:
[23-Mar-2020 12:53:25 UTC] PHP Notice: Undefined index: user_email in /OnTheGo/Sites/working/wp-content/plugins/miniorange-login-openid/class-mo-openid-login-widget.php on line 2065
[23-Mar-2020 12:53:25 UTC] PHP Notice: Undefined index: social_id in /Users/nigelanderson/OnTheGo/Sites/working/wp-content/plugins/miniorange-login-openid/class-mo-openid-login-widget.php on line 2066
[23-Mar-2020 12:53:25 UTC] PHP Notice: Undefined index: social_app_name in /Users/nigelanderson/OnTheGo/Sites/working/wp-content/plugins/miniorange-login-openid/class-mo-openid-login-widget.php on line 2067
I'm escalating this so that it can investigated further, and I'll let you know when there is some progress to report.
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Actually, those PHP notices are generated with only the social login plugin activated, and no other plugins (including Toolset) active.
Those same PHP messages are shown when you log in to a site with just that plugin active.
We can't debug an issue with a broken plugin.
Please contact the plugin authors and ask them to fix the problem they have with their plugin.
When they have, if you still see a problem with the Toolset redirection, then you can open a new ticket (link to this one), and then we can investigate the issue.