Hello @sb4ca, There isn't a separate support group for CIDP or CVID but there are other discussions for the conditions that you might find helpful including this one in the Autoimmune Diseases Support Group:
--- Does anyone else have CVID?: https://connect.mayoclinic.org/discussion/does-anyone-else-have-cvid/

If you type into the search box at the top of the Connect window and type in a term or phrase, you can locate other discussions, comments, newsfeed articles and more. I searched using CIDP and using CVID and here are the search results:

--- CIDP: https://connect.mayoclinic.org/search/?search=CIDP
--- CVID: https://connect.mayoclinic.org/search/discussions/?search=CVID

Hope this helps.