Google Login [redirect_uri_mismatch] Update 5.2.2

I've never seen that error message before, and I'm not sure what would be causing it. Can you try the following setting changes to see if either helps the situation. If so, that will help us narrow down the problem and determine what to do next:
* Disable caching (if enabled) in the Joomla -> Global Configuration area
* Disable SEF URLs in the Joomla -> Global Configuration area
* If you have a 3rd party SEF extension, please disable it as well.

Again, after you test those changes, let us know if that fixes the error. We can help determine what to do next after that.

Thanks,
Alex

Autotune does a lot 'under the hood' to try to reconfigure and auto-correct some problems where it can. I'm not sure what it may have done, but it's definitely possible that it fixed whatever issue you were having.

If you run into anything further or have any other questions, just let us know!

Thanks,
Alex