If your device is managed by a school, many "hacks" (like Developer Mode) are usually disabled. However, you can try:
If you’re trying to access a site or app on your Chromebook but keep hitting a block, don’t worry—you have options. Here’s how to unblock content, depending on the situation. how to unblock something on chromebook
Here’s a post you can use or adapt for a blog, social media, or help guide: If your device is managed by a school,
Sometimes, a site isn't blocked by an administrator, but by a simple setting or a browser glitch. Before trying technical workarounds, check these: or help guide: Sometimes