Aside from that message above, I have confirmed that your fixes have resulted in fixing both of the problems now.
The campaign owner is now able to refresh the campaign details (he was previously receiving the same error I was when trying to connect and disconnect patreon), and I am now able to verify my pledge and get access.
I’m still concerned that you’re being told we don’t actually have tiers (because I’ve had other people test and we all definitely have tiers selected), but it does work now at least.