Your sender ID does not match the sender ID for this push token. Verify that you are using the correct package name under your account's Android Push Notification settings. But when I send notification from firebase console they work fine. 

Steps  to reproduce the issue:

1- Create campaign on klaviyo
2- Select the audience list
3- Add some description for the notification
4- Click on Send Preview and add the push token get from the firebase
5- klaviyo shows error "Your sender ID does not match the sender ID for this push token. Verify that you are using the correct package name under your account's Android Push Notification settings."