Okay, do you have any problems with logging into the bot account on twitch.tv website?
If you can login into the twitch.tv website with your bot, try removing deepbot connections in your settings on twitch.tv.
Then restart deepbot, and run deepbot as admin. Once you ran deepbot as admin, try doing OAuth Login again.
You kept the same bot name with the name change request, so not sure why you are getting this issue.