I am the guild leader of on US-Lightbringer. I have linked my bnet to my profile and even tried removing and re-adding the link, but the guild does not exist on logs. I noticed after relinking, it is still showing an old guild I no longer have any characters in as well. My active characters are all in Pro Gamers, and the guild does not show in my profile page, clicking the link from raider-io gives a cannot find guild page, and my character pages show that they are guildless
If the guild doesn’t exist on WCL, you’ll have to make it (right sidebar).