The AddSecureRemoteProvider function didn't add secretKeyring to the remoteProvider struct.

viper.go

diff --git a/viper.go b/viper.go
index d95ca28..2b651f8 100644
--- a/viper.go
+++ b/viper.go
@@ -286,6 +286,7 @@
 			endpoint: endpoint,
 			provider: provider,
 			path:     path,
+			secretKeyring: secretkeyring,
 		}
 		if !v.providerPathExists(rp) {
 			v.remoteProviders = append(v.remoteProviders, rp)