When you register a new domain and start hosting content there, people might not be able to view it if they're behind some kind of security software or hardware that filters by domain (e.g. web/content/DNS filters). This is because the domain is new and hasn't been categorized by the security filter, and filters commonly don't allow traffic to uncategorized domains.
Usually people can contact their security provider to request the domain to be unblocked, but:
- this process can take a few days or longer
- sometimes this has to be handled by IT internally and might not be escalated to the provider
- because of this, sometimes the domain will just be unblocked for a set of people (e.g. everyone at a company) and other companies have to repeat this
- depending on how the filtering is implemented (e.g. how requests/responses are intercepted), websites might just appear broken instead of getting an explicit message about the website being blocked
- usually this approach is reactionary, because