Is there a chance that the new one requires an 'app password'?
Quote:
Trying to sync a calendar from your Fastmail account to a device via CalDAV can generate errors.
- Your username/password is wrong. Check caps lock isn't on, and for common visual errors like mistaking a 0 (zero) for an O (capital o), or a 1 (one) for an l (lowercase letter L).
- You are using your normal password, or your 2FA password. This doesn't work with a mobile device: you need to use an app password for CalDAV or CardDAV access.
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