Image not appearing when sharing link on Facebook

I'm experiencing an issue with my website, https://maisvagas.co.mz/, when shared on Facebook, the image doesn't appear. This is likely due to the hosting blocking some requests on images from Facebook servers. I'm seeking a professional who can help me resolve this issue.

Key Requirements:
- Access to the administration panel of my website to make necessary changes
- Proficiency in Osclass, the platform on which my website is built
- Expertise in resolving server-related issues such as blocking of requests

Your main tasks would include:
- Identifying the root cause of the issue
- Implementing necessary changes on the website's administration panel to allow image request from Facebook servers
- Ensuring that the images appear correctly when the link is shared on Facebook

Ideal Skills:
- Familiarity with server configurations and hosting settings
- In-depth knowledge of Osclass or similar CMS
- Proficient in troubleshooting and resolving website sharing issues on social media platforms, especially Facebook

Note: I've not made any changes to the default theme of my Osclass website, except for changing the hosting.