I don’t have any difficulty using ChatGPT with my brave browser on a desktop PC running Windows 10, but I use it with poe.com which is quite an excellent website, because it gives you access to several different AI bots.
To get an account with POE you may have to get an account with QUORA, which is no big deal because QUORA is in itself quite a good website in my (humble) opinion. 
https://www.quora.com/
I hope this is helpful to you
BTW both QUORA and POE are free at the basic level.
I was able to use ChatGPT with brave without problems since the beginning. However, without making any update, it suddenly stopped working and I am getting a
ttps://chat.openai.com/backend-api/conversation 403 (Forbidden)
I am logged in as always using my google account and I can run chatGPT normally with other browser like Firefox
no you wont have to uninstall a browser, but fix the correct setting. I also assume you can backup the settings and re-import them
This topic is closed as it’s old and the OP hasn’t been active for a long time. If you have any current issues, please open a new topic and provide as much detail as possible, including what’s happening, the version of Brave you’re using, and your OS. Thanks!