Microsoft Advertising Temporarily Suspends Client Connection Requests
Briefly

Microsoft Advertising has paused the functionality for agencies to send client connection requests to manage client ad campaigns, requiring agencies to contact support and wait 5-7 days for approval. This action, confirmed by Microsoft as a security measure against fraudulent activity, significantly delays the workflow for managing multiple client accounts. Kirk Williams highlighted the frustration this has caused among agencies, emphasizing the need for swift resolution, as Microsoft reassures the urgency will be prioritized.
These requests have been forwarded to our Engineering team, who will handle the linking on your behalf. At this time, due to a recently implemented security measure, agencies are temporarily unable to send new client connection requests directly... the policy is currently applied universally.
Microsoft has confirmed it is not a bug, and that it is because of fraudulent activity. I'm unsure whether it's temporary, but I sure hope so cause this suuuuucks....
Read at Search Engine Roundtable
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