I cant sign in to my phone to access settings gear
You dont need to sign into your phone to pull the strings.
Moreover the blue ish wont allow you to sign in if your phone is locked.
Thats why it is very important to turn On all security features( i mean all lock mediums like fingerprint, irish scanner, direction lock. All activated for Screen lock) on your phone.
I encountered the same issue with my samsung m31 where this accessibility setting accidently turned on. As i read many replies here i saw suggestions like pressing the home key 3 times simultaneously, emergency mode, settings etc. but none of these worked and my settings also couldn't be accessed so i just did a few simple steps :
1. long press power button
2. turn on emergency mode
3. once 100% complete, click on 3 dots that appear on the top right corner
4. select settings
5. in settings, go to accessibility
6. go to screen reader
7. lastly turn off voice assistant and your phone will be back to normal.
then you may turn the emergency mode off and enjoy your normal phone ; )!!!