"To access your work account on this device, you'll need to set a lock screen" but I have a lock screen

I just bought a new Xiaomi 14t phone, which came with HyperOs installed and which I want to use with both my personal and work accounts. Both of these are Gmail/Google accounts. I have therefore set up Xiaomi's second space and tried to use my work email as the second space's main account. This isn't working, the account seems to be added but I get a notification with: > Account action required > > my.email@my.company.com Tapping the notification does nothing, but when I go to Settings -> Google -> Manage account, I get: > Something went wrong. > > Some info may be out of date. Please try again later. At some point, I managed to get to a screen that told me: > To access your work account on this device, you'll need to set a lock screen. This is your organization's mobile device policy. Sorry, I can't seem to figure out how to get back to that screen now. In any case, OK, I need a lock screen, but I have one! I have set a lock screen password on both spaces (main and "second space") so why isn't this working? Is there something else I need to do to "set a lock screen"?