When using IP allowlist feature, the custom mail handlers do not open on Service Projects

Issue Summary

When using the IP allowlist feature, when you try to add a custom mail handler on Service projects, by clicking on the Google or Microsoft icons, the screen opens and closes instantly.

Steps to Reproduce

1. Add IPs to the allowlist on the admin panel
2. In a service project, try to add a custom mail handler, by clicking on the Google or Microsoft icons

Expected Results

The window opens to continue with the process.

Actual Results

The window opens and closes instantly.

Workaround

Reach out to Atlassian Support to provide the IPs that need to be added to the IP allowlist in order to grant access to custom mail handlers.