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This is the personal server of Ruari (but Stu is here too).

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Velocipede Rider

As part of this they have locked down certain services (e.g. email verification). Thus you cannot create new Casio IDs, which explains this Reddit thread:

reddit.com/r/casio/comments/1f

That's a problem if you recently bought a new watch that has any Bluetooth syncing capability and did not already have a Casio ID because the official Casio app requires you to login before usage.

ℹ️ You might be able to use a third party app like "G-Shock Smart Sync" (Ivo Zivkov) which doesn't require login.