You power hit this niggling barrier too (it upright happened to me). Everything is frame-up and linear o.k. and your Apple iOS Developer permit expires and all of the sudden, Xamarin starts complaintive roughly no valid signing keys when you try to debug on an iOS gimmick.
As farsighted as you’ve already renewed your annually developer explanation with Apple, it’s a wanton fix, upright do the pursual:
If it’s afford, closure Xamarin Studio (or the Xamarin Habitus Innkeeper if operative in Optic Studio).
In your Xamarin task you mightiness sustain to spread the preferences choice iOS Pile Signing Indistinguishability and take a new indistinguishability from the lean of uncommitted identities.
If you are victimization Optic Studio and a Xamarin Body-build Emcee, you power let to gulf from the innkeeper and reconnect to see the modify in the signing identities.
Delight let me recognise if you bear any questions.