Problem with User auth and send FCM notification

[kae90]

Hi, I've always used service auth on the ESP8266. I wanted to use user auth now, but I noticed I get a -401 error when sending FCM notifications. Does sending notifications only work with service auth?

[mobizt]

FCM is the server backend features which requires the OAuth2.0 authentication. The ID token authentication (user auth) is not supported.

[kae90]

Ok thanks.