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Error when accepting Guild Invite

I am not part of a guild, but every time I accept an invite from “Back & Blackstone” on the XBox, I get an error that says “Join by invite only”, then it the email goes to my completed items, but i’m not in the guild.

When I search for the Guild, I find it but it says “Invite Pending”
Have had 2 or 3 attempts now with no luck. Any help would be appreciated.