We have released a fix for this issue and are continuing to monitor it.
UK SMS subscribers should now be able to manage their subscriptions as expected. Subscribed components should be accurately reflected in the UI (if the page has enabled component subscriptions). Subscription cancellations should now be possible.
Posted Apr 13, 2020 - 16:10 PDT
We've identified a problem with our phone normalization code that's causing existing UK SMS subscribers to be incorrectly categorized as new subscribers. As a consequence these users are redirected to the new subscriber component selection screen instead of the subscription management screen. This is causing these subscribers to be unable to manage their existing subscriptions.
Posted Apr 10, 2020 - 18:09 PDT
We are investigating an issue with SMS subscription management on status pages.
When managing subscriptions, existing subscribers using phone numbers in the UK will be erroneously redirected to the new subscriber page and will not be able to see the unsubscribe link. For pages using component subscriptions, these subscribers will see all components as selected which may not match their current saved settings. Any updates to subscribed components are still accepted and saved.
Notification delivery during this time remains unaffected.