Nevermind. I actually ended up fixing it by following the instructions from @olivierlambert on this post.

https://xen-orchestra.com/forum/topic/97/invalid-credentials-on-login-after-updating-to-4-8

I reset the credentials using his instructions and now I can log in with admin@admin.net/admin. Strange! I'll leave this post up in case anyone else comes across this issue.

Hi, I'm new to XCP-ng. I'm trying it out because it is well recommended and I want to get away from VMware. I've got my server all set up. XCP-ng Center is working fine but I wanted to try out the XOA web interface. So I used Quick Deploy and deployed it, I didn't change any of the defaults but I cannot log in to it via the web interface. When I use the default admin@admin.net/admin credentials, it comes back with "invalid credentials". I was able to SSH into it though using the default xoa/xoa credentials. Please help!