Hello,
I use another platform besides Simplifi and they had the same connection issue with CIT bank. They told me that Plaid has resolved the issue. So I tried it with Simplifi just now and it seems to be working.
They also had the same issue with LPL and plaid. Their connection seems to be working but Simplifi is only pulling data from two of my four accounts.
Just thought I would pass it on.
Dominic