“why can’t we question why “Sola Scriptura” cannot be found in the bible?”
You can.
The principle of the highest authority of God- breathed Scripture is everywhere in Scripture.
Perhaps you are not clear on the meaning of Sola Scriptura?
Also, sounds like you should review how God gave us Scripture and Christ’s words concerning Scripture.
Best.
Sola scriptura (Latin: by scripture alone) is a theological doctrine held by Christian denominations that the Christian scriptures are the sole infallible rule of faith and practice.
This doesn’t say it’s the highest authority, it says it’s the sole authority.
Perhaps you’re not clear on the meaning, so I’m trying to help.
It’s the defining principle you go buy, but is unbiblical itself, which means you can’t follow it, since it isn’t in scripture. Scripture does say to follow both written and oral teaching, however. I’m sorry I went from memory, I know we should always google, copy and paste scripture.