In Realms, when I write on a sign including my own name of the name of the world, it either blanks out (showing nothing) or it writes over the word with #####... It is very frustrating and needs to be fixed!!! I would like to be able to write things like I always have done!
According to my research, many others seem to have this issue!!!
I'm not sure if it is a content filter or something, I just know that I want to see it fixed so I can correctly name my house and city!!!
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The strangest innocent words get censored with hash marks. This really is an insane thing and needs to be revisited. The problem is obviously somewhere between the XBL censorship code and Mojang's chat / signage implementation.
Are you able to give an example of the exact phrase that is being censored out? (Please only share it here if it does not contain your gamertag or personal information, though.)

I tested on a Realm in 1.14.60 using Xbox One. The following names, when entered on a sign showed very briefly on the sign and then it turned blank. Each name was entered separately on a new sign:
David Samuel Michael Brandon Daniel Donald Oliver
These names and other words all worked on a sign, again each on a separate sign:
Eliza Elizabeth Mike Dan Mat Matthew William Mojira North South East West
Unless I'm mistaken, that's the chat filter, which is something that Bedrock Edition has in order to allow console players to have multiplayer.