Now many users are facing the issue of “Couldn’t verify. Sign in to your account again and start over.” while clicking on add account and device option for unlocking the bootloader of Xiaomi phone.
So I will be sharing a simple workaround to solve this problem. To know how to unlock the bootloader of any Xiaomi Phone click the link below.
How to fix “Couldn’t verify. Sign in to your account again and start over.” Error on Unlock Bootloader
Step #1: Go to Settings >> Mi Account >> Sign out and then click on Keep or Remove depending on your preference. Enter the password of your Mi account and your account will be removed.

Step #2: Then again Go to Settings >> Mi Account >> and Sign in to the same account in which the sim is on your phone.
Step #3: After doing this you will not face this error and will be easily able to add account and device.
Step #4: To do that simply go to Settings >> Additional settings >> Developer options >> Mi Unlock Status >> Click on Agree and then Add account and device.

I hope this little trick helped you. If you are facing any other error then comment down below.
Your method of telling everything in this piece of writing is in fact pleasant, all can effortlessly know it, Thanks a lot.