diff --git a/conf/config.yaml b/conf/config.yaml
index 6d65a8b..f2dd51e 100644
--- a/conf/config.yaml
+++ b/conf/config.yaml
@@ -659,7 +659,7 @@ oidc-scopes:
 # which only correlated users with their email address. Should be set to false for most usecases.
 # Options: [true, false]
 # Default: false
-oidc-link-existing: false
+oidc-link-existing: __OIDC_LINK_EXISTING__
 
 # Array of string. If the returned ID token contains a 'groups' claim that matches one of the
 # groups in oidc-admin-groups, then this user will be granted admin rights on the GtS instance
diff --git a/scripts/install b/scripts/install
index 12b1c9c..6fc85f1 100755
--- a/scripts/install
+++ b/scripts/install
@@ -82,6 +82,7 @@ oidc_skip_verification="false"
 oidc_issuer=""
 oidc_client_id=""
 oidc_client_secret=""
+oidc_link_existing="false"
 
 smtp_host="localhost"
 smtp_port="25"
@@ -159,6 +160,14 @@ ynh_app_setting_set --app="$app" --key=statuses_poll_max_options --value="$statu
 ynh_app_setting_set --app="$app" --key=statuses_poll_option_max_chars --value="$statuses_poll_option_max_chars"
 ynh_app_setting_set --app="$app" --key=statuses_media_max_files --value="$statuses_media_max_files"
 
+ynh_app_setting_set --app="$app" --key=oidc_enabled --value="$oidc_enabled"
+ynh_app_setting_set --app="$app" --key=oidc_idp_name --value="$oidc_idp_name"
+ynh_app_setting_set --app="$app" --key=oidc_skip_verification --value="$oidc_skip_verification"
+ynh_app_setting_set --app="$app" --key=oidc_issuer --value="$oidc_issuer"
+ynh_app_setting_set --app="$app" --key=oidc_client_id --value="$oidc_client_id"
+ynh_app_setting_set --app="$app" --key=oidc_client_secret --value="$oidc_client_secret"
+ynh_app_setting_set --app="$app" --key=oidc_client_secret --value="$oidc_link_existing"
+
 ynh_app_setting_set --app="$app" --key=smtp_host --value="$smtp_host"
 ynh_app_setting_set --app="$app" --key=smtp_port --value="$smtp_port"
 ynh_app_setting_set --app="$app" --key=smtp_username --value="$smtp_username"
diff --git a/scripts/restore b/scripts/restore
index 1b8b050..a22d13f 100755
--- a/scripts/restore
+++ b/scripts/restore
@@ -87,6 +87,7 @@ oidc_skip_verification=$(ynh_app_setting_get --app="$app" --key=oidc_skip_verifi
 oidc_issuer=$(ynh_app_setting_get --app="$app" --key=oidc_issuer)
 oidc_client_id=$(ynh_app_setting_get --app="$app" --key=oidc_client_id)
 oidc_client_secret=$(ynh_app_setting_get --app="$app" --key=oidc_client_secret)
+oidc_link_existing=$(ynh_app_setting_get --app="$app" --key=oidc_link_existing)
 
 smtp_host=$(ynh_app_setting_get --app="$app" --key=smtp_host)
 smtp_port=$(ynh_app_setting_get --app="$app" --key=smtp_port)
diff --git a/scripts/upgrade b/scripts/upgrade
index ddbb328..bb1e85f 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -75,6 +75,7 @@ oidc_skip_verification=$(ynh_app_setting_get --app="$app" --key=oidc_skip_verifi
 oidc_issuer=$(ynh_app_setting_get --app="$app" --key=oidc_issuer)
 oidc_client_id=$(ynh_app_setting_get --app="$app" --key=oidc_client_id)
 oidc_client_secret=$(ynh_app_setting_get --app="$app" --key=oidc_client_secret)
+oidc_link_existing=$(ynh_app_setting_get --app="$app" --key=oidc_link_existing)
 
 smtp_host=$(ynh_app_setting_get --app="$app" --key=smtp_host)
 smtp_port=$(ynh_app_setting_get --app="$app" --key=smtp_port)
@@ -353,6 +354,7 @@ then
 	oidc_issuer=""
 	oidc_client_id=""
 	oidc_client_secret=""
+	oidc_link_existing="false"
 	# registration of parameter
 	ynh_app_setting_set --app="$app" --key=oidc_enabled --value="$oidc_enabled"
 	ynh_app_setting_set --app="$app" --key=oidc_idp_name --value="$oidc_idp_name"
@@ -360,6 +362,7 @@ then
 	ynh_app_setting_set --app="$app" --key=oidc_issuer --value="$oidc_issuer"
 	ynh_app_setting_set --app="$app" --key=oidc_client_id --value="$oidc_client_id"
 	ynh_app_setting_set --app="$app" --key=oidc_client_secret --value="$oidc_client_secret"
+	ynh_app_setting_set --app="$app" --key=oidc_client_secret --value="$oidc_link_existing"
 fi
 
 #=================================================