Same problem here. On the Loop "getting started" workspace there is a section for "Get the mobile app" with a QR to install on Android, its got a <<Note: When using an M365 work or school account, you may need to enroll your account, or ask your IT administrator to approve using Loop.>>
However it seems that its the other way around, only people with a work or school account can use the app.
Could you please either or Clarify if the app is only for work/school accounts or the info in the trial is wrong.