iPassword 8 - error signing in when using proxy

I have a required local proxy security software (including SSL) on some of my systems for work, I've found there seems to be a problem with version 8. I can't sign in, it just gives a sign-in error, but if I look in the logs I'm getting some kind of HTTP error. With an identical system version 7, even the betas, work perfectly.

I can't exclude applications from it but I can exclude URLs if necessary.

These are the relevent log entries - If I try multiple times they just repeat each attempt.

WARN 2021-11-16T09:32:02.737 tokio-runtime-worker(ThreadId(5)) [1P:op-db-queue\src\operations.rs:1195] operation transaction #tx#7(set_object_bytes) took more than 100 ms (128 ms)
INFO 2021-11-16T09:32:07.473 tokio-runtime-worker(ThreadId(8)) [1P:foundation\op-windows\src\windows\network\proxy.rs:127] network proxies discovered: 1
INFO 2021-11-16T09:32:07.923 tokio-runtime-worker(ThreadId(8)) [1P:foundation\op-windows\src\windows\network\proxy.rs:220] proxy connected successfully
INFO 2021-11-16T09:32:07.923 tokio-runtime-worker(ThreadId(3)) [1P:foundation\op-proxy\src\lib.rs:150] selected HTTP proxy to use
ERROR 2021-11-16T09:32:08.118 tokio-runtime-worker(ThreadId(5)) [1P:op-app\src\app\backend\signin.rs:304] error signing in from data layer: UnableToCreateClient(HttpError(IoError(IoError(error sending request))))
ERROR 2021-11-16T09:32:08.118 tokio-runtime-worker(ThreadId(5)) [1P:C:\builds\dev\core\core\op-signin\src\lib.rs:421] error signing in from data layer: other error
ERROR 2021-11-16T09:32:08.118 tokio-runtime-worker(ThreadId(5)) [1P:C:\builds\dev\core\core\op-ui\src\signin\handlers.rs:363] Error signing in: other error

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1Password Version: 8.04 (from logs)
Extension Version: 2.1.4
OS Version: Windows 10 x64