When you get the charm, you have the ability to enable or disable it. While you're online, you can enable and disable normally, there isn't an issue with that.
However, if you disable, then relog, you won't be able to switch the charm back on after rejoining. The icon is permanently grayed out, with no option to click it.

The only fix for this that I can find is a server restart. When the restart occurs, the charm is selectable again.

Actually, i've been experiencing issues with just a normal relog as well, not even when it's disabled.

One last note, not sure if this would affect it, but we have disabled the charm from being given upon getting to 100% and are only giving them out via the "/shinycharm" command in game to further limit their exclusivity. Not sure if the fact that it's disabled and we are giving them has anything to do with this issue. Will try to test some more in SP.

Single player provided no issue with the charms. Every option I tried that broke if on our server didn't work in SP. Looks to be an issue with servers specifically, hopefully it's not just me!

Hi, thanks for reporting. As you've said this seems to be a server issue, as it doesn't seem possible to reproduce in single player. I'm personally not sure what is going on though. I've heard the same thing from one other person on discord though so if you or anyone else reading this manages to come up with any more information that would help us get to the bottom of this then please do post it here.

This ticket is expired. If you believe it is still an issue, please make a new ticket.