List inboxes you can query

Returns the email and phone/SMS inboxes available to the credential, for use as the channelId on the messages and analytics endpoints.

With delegate-token auth (inboxes:* scope) results are limited to inboxes the authenticated user can reach, and each entry carries access: owned when the user is a member of the inbox (directly or through a team), monitored when it is another user's private inbox that the caller is permitted to monitor. scope filters on that value.

Monitoring requires the conversations.monitor_admin permission on the caller and conversations.monitor_access on the inbox owner's role, so a caller without those permissions sees only owned inboxes.

API keys and partner tokens are company-scoped and carry no user identity, so they return every inbox in the company, omit access, and reject scope with a 400.