What Is Facebook Error Code 504?
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Error Code 504 is yet another error associated with Google Play Store when trying to download the Facebook app. This doesn’t happen always with Facebook though, but since it’s a mega-popular social network, it seems like it’s the most common. However, 504 error is actually a gateway timeout error which means there is a problem with the internet connection (wifi, mobile data).
This also means that this error might not be something you can fix with your phone. Instead, you might need to check your internet connection, maybe restart the router or something similar. At any rate, here are some fixes for you to try.