Hey @Flog1974,
Sorry for any confusion this has caused. Adding your smartwatch pairing plan is triggered from adding the feature in the Wearables app, rather than separately logging into My3.
There's a bit more info and FAQs here: https://www.three.co.uk/support/sim-support/smartwatch-pairing-support
For the "one of the fields is missing" error there's a few things that will help, and once you successfully bypass this it should add your pairing add on. Here's some things to check/try.
Make sure you can access My3 on your browser of the Three App. It sounds like you've already done this.
If you're using a My3 password including special characters, try changing this to one that only uses Upper case, lower case, and numbers.
Clear your history and browser data
Set your browser back to the default one if you installed an alternative one
When you next try to pair, make sure not to copy paste any info in, and if your info is autofilled, clear this off and enter it manually. Some customers have been saying this seems to be more reliable if you enter the password first, then the username/email.
Hope this helps,
Jonathan
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