I've looked through some previous posts and their extensive comments on this forum already about a three-field login, but I'm still having some issues. I've tried creating a login manually and can even see that the third field is being saved in the 'Saved Form Details' section, but it won't be autofilled under any circumstance. I've tried the latest 1Password stable and beta builds and they both have the same behaviour.
I think it's worth referencing the site as this may help: dashboard.dealersolutions.com.au
The 'Client Number' field is the field not being autofilled.
1Password Version: 7.7-BETA-4
Extension Version: Not Provided
OS Version: macOS 10.15.6
Sync Type: iCloud
Referrer: forum-search:Three field autofill