wixSecrets suddenly stop working!

My code worked great, until about 30 minutes ago, when all of a sudden, when I try to get a secret, I get this error:

Cannot read property ‘getSecret’ of undefined

my code is very simple and worked fine:

let fcmKey = await wixSecretsBackend . getSecret ( “FcmKey” );

what is the issue? I have few different accounts and sites and they all have the same issues, which means they can’t work properly