When I submit picks via the Web Entry Form, the resulting page gives me an error that:
The Pool Manager (email address) is not registered for 2011. Your picks were not recorded or sent.
However, I am registered and have a valid key.
If you generate a Web Entry form before entering in the registration code, you may see this error. Just to be sure, make sure the registration code has been entered and then re-generate the Web Entry Form.
Also make sure you are 100% sure you're using the 2019 version of OfficePool and not a previous version.
If needed, start a brand new file from scratch.