Official response from Patreon about multiple accounts for a single campaign:
Aug 8, 11:06 PM PDT
Thanks so much for reaching out. At the moment, no, you cannot add another user as an administrator on your Patreon. The only way to share a Patreon account with someone is to have a shared email address that you stored in a secure vault like 1Password.
I totally understand how this isn’t ideal— especially for creators with multiple people involved. This is definitely an enterprise feature that we plan on building a system for in the far future, but if I’m being totally honest, it’s not yet on our roadmap so I can’t give an ETA.
Hope this clarifies and have a good day.