I have been advised to make a bug report on this matter.
Ticket reference number US101059430
adding some info for others
i am unable to link mounts to chat, only on my main character drakcow-thrall
other characters work fine no issues
relevant forum posts
-Not able to link mounts in chat?
2 more links i will be adding later becuase im limited to only adding 2 links to my post
Upon Shift+Clicking a mount into chat, example the “Delver’s Dirigible” put into chat
|Hmount:446052:118919:IJZI]vIJ]I^VIJ^I^gIJ_I^nIP^I^QIUkKqpIUrKrIUvKrlIUzKr{IVIKsNIVMKsfIVOKsrIVQKtWIVRKtgIXmLoIXoLrIZkKbmIZuKoSI[MLssI[eKpXI[oKpmI[yKqJIhePdVIhfPdUIhgPdeIhhPd\Ihi^pOIhjPd]IhkPdrIhlPdIhuPfQIhwPfjIhxPfnIhyPfrIhzPhZIh{PfxIiIPgMIiJPgOIiKPg
When pressing enter in /say my character says something unintelligible, /guild i get an error saying “Couldn’t send messege” in some other chats such as /instance nothing happens
In summary
a Full UI reset has been tested with (no fix),
addons disabled (no fix),
this is only current affecting my main character, my alts which i dont actively play are fine
this is only affecting the mounts, i can link everything else just fine