Looks good for me for now. I deactivated the old plugin and installed the new one. I tried it with a scheduled post and this was the notification I received that sounds like it’s working to me:
OneSignal Push: Please try again in 1 seconds. Only one notification can be sent every 1 seconds.
OneSignal Push: Successfully scheduled notification to 118 recipients.
FWIW here’s my configuration:
Theme: Mantra Version: 3.2.0 By Cryout Creations
WordPress: Version 5.2.1
PHP: 7.2
Plugins:
Add From Server
Akismet Anti-Spam
AMP
Child Theme Generator
Classic Editor
Cryout Serious Theme Settings
Default featured image
Disable Real MIME Check
Duplicate Post
Easy Google AdSense
EasyRecipe Plus
Fast Velocity Minify
Featured Image Admin Thumb
Font Organizer
GA Google Analytics
Glue for Yoast SEO & AMP
Image Auto Poster
Ivory Search
Jetpack by WordPress.com
My Calendar
OneSignal Push Notifications
Pinterest Pin It Button On Image Hover And After Post & Page Content
SSL Insecure Content Fixer
Webcraftic Clearfy – WordPress optimization plugin
WP Database Backup
WP Extended Search
WP Featherlight
WP Super Cache
WPMobile.App — Android and iOS Mobile Application
Yoast SEO
