Cannot Install Beta Office Version

I cannot get the beta version no matter what I try.

First I tried https://learn.microsoft.com/en-us/microsoft-365-apps/insider/deploy/registry:

reg add HKLM\Software\Policies\Microsoft\office\16.0\common\officeupdate /v updatebranch /t REG_SZ /d BetaChannel

After doing this, checking for updates still says "you have the latest Office updates" but it's still on Current Channel, I want beta.

So then I tried https://learn.microsoft.com/en-us/microsoft-365-apps/insider/deploy/user-choice:

reg add HKCU\Software\Policies\Microsoft\office\16.0\common\officechannelexposure /v insiderfast /t REG_DWORD /d 1
reg add HKCU\Software\Policies\Microsoft\office\16.0\common\officechannelexposure /v firstreleasecurrent /t REG_DWORD /d 1
reg add HKCU\Software\Policies\Microsoft\office\16.0\common\officechannelexposure /v current /t REG_DWORD /d 1
reg add HKCU\Software\Policies\Microsoft\office\16.0\common\officechannelexposure /v monthlyenterprise /t REG_DWORD /d 1

This also had no good effect. Now Office applications say my Org has set policies, but the option to set my channel is still disabled.

What am I doing wrong? I just want to try out =Copilot() in Excel. I'm not only the administrator for my local machine, I'm also the admin for my organization. I must be missing something obvious here.

[Moved from Microsoft 365 Insider | Install, activate, and update | Windows]