App still failing at delivering Push Notifications for random tokens/devices, with error: Unable to retrieve the FCM server key for the recipient’s app. Make sure you have provided a server key as directed by the Expo FCM documentation.
Can you describe with as much detail exactly how often and when the errors occur. In the first post, the user indicates it would happen intermittently every other couple of days. The second post seems to indicate they stopped working altogether.
If you have any other information to provide you think would be helpful, please pass that along as well.