Thanks for response. Now I tried many things. APS certificate was still valid, but I created a new, to be sure. Downloaded aps.cer, created in IDE firebase_push.p12, uploaded it to firebase console, downloaded the GoogleService-Info.plist to special folder. No success.
Than I saw, that I have two Apple Push Services in Apple Certificats. The old and the new one. So I revoked booth and created a new. Of Course repeating all this funny file exchanges (up-downloads) - No success.
Than I saw, that my profiles (Ad hoc and App Store) are not valid any more. Guess, because I revoked the APS Certificates. So with "Edit" I could renew this certificates and download it. App shows no errors, but I can not receive this firebase messages, what ever I try. What else can I do?
This is the log:
Application_Start
Application_Active
FCMConnected
GetToken: ...
Application_Pushtoken
PushToken: 1
<B4IExceptionWrapper: (null)>
Class (b4i_httpjob) instance released.