DeletedUser34 I have no idea why it isn't working for you, maybe you messed with a toggle you shouldn't have.
Try removing Brave from Obtanium and starting again from scratch, following the exact steps as below and not changing anything else:
Paste this link: https://github.com/brave/brave-browser
Write Release in the section Filter Release Titles by Regular Expression
Write Bravearm64Universal in the section Filter APKs by Regular Expression
I just deleted my Brave configuration from Obtanium and followed the same steps and it worked just fine. It has to be user error of some kind.