A few users reported this issue and I was able to reproduce it, so I'll report it here.
Go to Connected account providers and test Google.
It'll show the following error message:
"An error occurred while connecting with Google. Please try again later."
It worked perfectly for years, and now...
Addon which adds Discord as account provider? I know about KL user enhancements, but I don't need all those features (also it costs 50 bucks if you have user upgrades on your website..). I just need a simple account provider for discord :)