Thank you for contacting the Google Ads API support team.
Please be informed that the Google Ads API does not offer a direct, single-call batch operation to retrieve all CustomerManagerLink and CustomerClientLink information (including associated link requests) across all sub-accounts under a main MCC. Instead, you can use the customer_client resource to get the list of sub-accounts under a manager account. Kindly refer to the below given GAQL query to retrieve the list of customer IDs under your MCC below:
SELECT customer_client.client_customer, customer_client.descriptive_name,
customer_client.manager FROM customer_client
Also, the link request status is stored within the CustomerManagerLink and CustomerClientLink resources. Since you are querying down from the manager, the most direct resource to query for all links, including the status, is the customer_client_link resource. Please find the below given GAQL query for links and their status.
SELECT customer_client_link.client_customer, customer_client_link.status,
customer_client_link.manager_link_id FROM customer_client_link
The customer_client_link.status field will be an enum, and you are interested in the PENDING status, which represents an outgoing link invitation from your manager to a sub-account that has not yet been accepted.

[2025-11-05 15:41:42Z GMT] This message is in relation to case "ref:!00D1U01174p.!500Ht01vSi1G:ref" (ADR-00338534)