OIDC Callback Slow

Product: PowerShell Universal
Version: 3.8.1

I’m seeing some very slow response time after logging in from our OIDC provider. It seems like the authorization-code/callback call ends up taking roughly 60 seconds. I’ve tried hosting with IIS and hosting with Kestrel - no difference there. Our roles are pretty simple - if a member of Group X, assign to administrators, otherwise they’re a normal user.

Anyone have any thoughts?