Firewall configured with Guest Services -> Policy page without authentication page is broken post upgrading to 7.3.2. The guest users will be re-directed to "This page is redirecting. Click Here" message instead of "Terms of Use Agreement" configured in the Policy page without authentication section of the zone settings.
Symptom/Error would look something like this:

To temporarily fix the issue, the workaround is:
1. Navigate to Network | Interfaces and Edit the Interface on which Guest users reside/connecting from
2. Enable "Add rule to enable redirect from HTTP to HTTPS" but in order to enable this, should either enable "HTTPS management" or "HTTPS user login"
For demonstration I have shown X0 interface setting:
3. If HTTPS management cannot be enabled on this interface, you can instead enable “HTTPS user login.” This will automatically activate the setting “Add rule to redirect HTTP to HTTPS.” As a result, users and administrators will be prevented from logging in to the firewall on that interface, ensuring secure management access.
As far as the permanent fix/hotfix on this issue, its work in progress. We will keep this KB posted with the update on its availability.
Feel free to reach support via chat for any further assistance. https://www.sonicwall.com/support/contact-support