All of my other characters work fine, but for some reason my cleric is not showing up when I click on the link to join a campaign. I am using DnDbeyond for the convenience on leveling up and my DM is sharing content, but all my characters except the cleric show up to join. (They are already in campaigns, so they are greyed out)

Can anyone help me out?

Is the cleric already in that campaign?

No, they were in a campaign that had shut down, and we were making a new one with the same characters (different DM). The previous DM was not the one who shared content, as well. It's just weird because all my other characters in other campaigns appear (greyed out) but not her!

What I see

I’m not gonna use the link, but what probably happened is that the character got “stuck” in the campaign when it got shut down. Can you see the character listed under “My Characters?” If so you should be able to remove that character from that campaign there. If not then you don’t have that character anymore and will need to recreate it.

It is on "My characters," and is not in a campaign. Hence the confusion! Thanks for your attempted help, but I think I'll just have to copy what I had onto a more traditional sheet, then delete the character. Have a good day!

Yeah, it got stuck in hen the camping got deactivated. Contact the DM and ask them to reactivate that campaign so you can get your character out.