Learn English – “Not doing so” vs “doing so” after a negative

In this context, I would say the noun form of "authorized" would be "authorization," not "authority." In other words, "No authority" would be better expressed as "No authorization".

The words have multiple meanings, some of which overlap a bit. Generally speaking, though, "authority" means you have the power to do something, while "authorization" means you have permission to do something. One could argue that credentials grant you authorization, but not necessarily authority.

As someone else has already said, there is more than one way to convey this. Another you might consider is:

• Insufficient Authorization

It is stay focused. Subtitles are often unreliable. The people who do subtitling are not well-paid. Trust your teacher.

The 'ed' in focused is pronouced /t/ a sound which is unvoiced and not strong so it may get lost. Sometimes sound recording doesn't capture everything that is said and our brain fills in the gaps. A native English speaker who hears stay focus will unconsciously fill in the gap and believe they have heard stay focused.