Translations:Extension:GoogleLogin/PreAuthManager/24/en

"Special:GoogleLogin" or (in German for example) "Spezial:Mit_Google_anmelden"
The allowed redirect URI in Google developer console must be in content language. So, if your wiki has content language German, then type in "Spezial:Mit_Google_anmelden" and not "Special:GoogleLogin". If you used the wrong language, all Authentication requests will fail with redirect uri mismatch.