Hello@rbrown
Thank you for posting in the Community today thought I’m sorry that you are experiencing this issue with First Horizon Bank.
First, please review THIS ARTLICLE regarding the OL220 error. If you are using a VPN, be sure to turn it off when running the One Step Update. Note that if you are using Direct Connect and the financial institution states that they can't assist, an escalation with the financial institution may be necessary. If you are using Express Web Connect, you will need to contact QUICKEN SUPPORT.
Thank you
Quicken Diana