If you’ve already double-checked that your image URLs are correct, it’s possible that the server where the images are located may be blocking Bannerbear from viewing the images.
If you’re using Cloudflare or another content delivery network provider, you can whitelist the app.bannerbear.com domain to stop your server from blocking the Bannerbear requests.
Alternatively, you can use Bannerbear’s built-in Image Proxy feature to fix the issue.