Non-english keyboard, special characters and Wine Steam

I have an Estonian keyboard with characters not used in English, e.g. öäüõ. I use these characters regularly in passwords including my Steam password. However, now I can’t log into Win Steam through Lutris since it won’t accept these letters. I can’t use ALT codes either. Any advice how to configure Wine Steam to accept these letters?

I’ve almost lost my mind over this issue not so long ago. Tried a lot of things and one weird thing that finally fixed it for me was setting my primary language (Russian) as second in (Plasma 5.13) and English (US) as 1st. You can quickly test it with # setxkbmap -layout "us,es" (if “es” is Estonian, of course).