Steam ‘invalid credentials supplied’ Error – How to Fix?

I get an invalid credentials supplied error when I log into the Steam app on my smartphone. The app is displayed in my native language, but the error itself is written in English. I enter the correct username and password – this I can guarantee. So what’s the problem?

Solution

The “invalid credentials supplied” error in Steam is usually solved by a simple reinstall of the app. Some users solve this error by resetting the password for their account. If neither reinstalling nor resetting the password worked, it’s time to contact Steam support.

Authordman