MissmatchSenderId

[pageworker]

I've used the complete code from the training and when I want to send from the companion site it says in the popup MissmatchSenderId and I do not receive the push

[KravMaguy]

I have the same error:
Google please update your codelabs because I see many versions online of the same topic and ive had problems with most of them. Its hard to know which one is relevant or up to date anymore. Its far from clearly explained.