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It means that Google/Apple have censored the post or the page. Telegram does not practice censorship, but their application is hosted on the Google Play Store and AppStore, so they are dependent on Google/Apple censorship policies. But there is a simple and very quick solution to bypass all this censorship permanently:
It's very simple:
- Uninstall your current version of Telegram
- Reinstall the official version downloaded directly on Telegram website.