Identifying mismatched permissions between services can be challenging. To resolve this, enable the Admin console API, which allows you to programmatically manage API permissions. This enables you to automate the process of granting and revoking permissions, reducing the risk of misconfiguration.

Another challenge is managing the refresh token lifetime. If the refresh token expires, the connection will stop working, leading to data loss or service disruption. To prevent this, consider using a refresh token lifetime of 24 hours or setting up a monitoring system to alert you when the token is close to expiring.

Finally, cross-project access to connections requires granting permissions to specific projects. To simplify this process, create a service account and grant it access to the relevant connections. This eliminates the need to manually grant permissions to each project, reducing the risk of errors and ensuring consistent access control.