Email verification error: unauthorised

### Steps to reproduce

1. Where are you starting? What can you see? User Settings - Discovery - Share
2. What do you click?Share3. 4. More steps… Click on email link and get stuck in endless "error: unauthorised " messge. Have to kill app to get out of this.

### Outcome

#### What did you expect?

To complete email verification after clicking on the email verification link.

#### What happened instead!

One of these two error messages are produced:

error: unauthorised
error: the validation session has not been completed

Start by reproducing the flow from User Settings - Discovery - Share and the email verification link, then trace where the iOS app handles the link and reports the unauthorised or incomplete validation-session errors. Done means the link completes email verification without leaving the app stuck in an error loop.

Written by the indexing model from the issue text.