Hi,
There is a change in OneSignal API for VOIP : Issue Github
This is the OneSignal API with the new field : Here
Here it's my temporary fix in NotificationResolver.php :
->setDefined('apns_push_type_override')
->setAllowedTypes('apns_push_type_override', 'string')
Can you change your code ?
Thanks a lot for your work !
Valentin