Tenno,
We are aware of issues for the Warframe Steam Deck client as a result of the August Steam Deck System Update. Upon installing, the On Screen Keyboard no longer appears to let you enter your login details, preventing players from being able to log-in.
At this time, we recommend you avoid updating your Steam Deck to the August Steam Deck System Update until we find a resolution for this issue. We have contacted Valve and are looking for a solution with them. We’ll update this thread as more information comes in.
Thank you for your understanding and cooperation.