Comment by noname120

Pretty sure it's because literally all the signal.me links are the same when you remove the part after the #.

When you perform an HTTP(S) request you never provide the part after the # in the request URL, it's only interpreted by the web browser itself. It's likely that their antispam thing does the same and ignores the hash altogether.

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Example of link (blocked): https://signal.me/#eu/P01wpUmC4nT2BBTwMrPAw7Nxcp81055tKHGbYw...

Without the hash (blocked): https://signal.me/

There is no blocking if you add any letters in the path (e.g. “abc”): https://signal.me/abc#eu/P01wpUmC4nT2BBTwMrPAw7Nxcp81055tKHG...