The social links section on the Profile settings doesn’t recognize undercores on TikTok and Instagram usernames.
Threads seems to work as expected, as shown in the screenshot.
I know for certain those are valid usernames.
I’ve tried removing the underscores and the error message vanished.
When “save” is clicked, the Instagram field shows a link, but with the underscore removed from the URL (_mikannn becomes mikannn). The TikTok field, as far as I’ve tested, does not save any content at all if it contains an underscore.
I’m setting up a Ghost profile on a Chrome web browser on Windows 11.
I think I saw a patch to fix underscores in instagram a few weeks ago. If you’re on the latest version of Ghost, you might want to open an issue over on Github for these others.