Separate ownership from access first
Most failed handovers come from treating two different things as one. In Meta's structure, ad accounts, Pages and pixels (now usually called datasets) belong to a business portfolio, the familiar BM. That portfolio is the owner. Other portfolios or individuals only get partner or assigned-person access. Admin roles can be revoked at any time, while ownership decides whose entity the asset sits under in the long run. Before handover, confirm for each asset who owns it today and whether the receiving side gets ownership or just access. With access only, the original owner can cut it off and take spend history and data with it.
BM level: admins, verification and domains
Start by checking who the admins are in the outgoing portfolio and whether their two-factor authentication is controlled by the old team. The receiving side should hold at least two admins of its own to avoid a single point of failure. Then look at Business Verification. It is tied to legal entity details, so if the receiving entity is different, the old verification does not carry over and features that require it may need a new review. Domain verification and event priority settings also live under the portfolio and need rechecking after an entity change. If the old BM holds other clients' assets, move only the relevant assets rather than handing over the whole portfolio.
Pages: claimed ownership versus granted tasks
A Page can be claimed by only one business portfolio as owner. Others can request access. In the Page roles settings, confirm which portfolio owns it now and whether an individual account still holds full control. A common trap is a single full admin who is a former employee's personal profile. The receiving side should request ownership, or have the owner initiate a transfer, wait for approval, and only then remove old admins. Posts, comments and the Page's ad identity stay in place, but a linked Instagram account has its own ownership and should be checked separately rather than assumed to follow the Page.
Pixel and datasets: you move data assets, not performance
The value of a pixel is the event history and audiences built on it. Check the dataset ID owner, whether the site code is controlled by the receiving side, who generated and stores the Conversions API access token, and which custom conversions and event priorities exist. In many cases sharing the dataset with the new portfolio is safer than transferring ownership, since no site code changes are needed. Custom audiences, lookalikes and catalog links built on the old dataset may not carry over if you switch datasets. Run an event test during the handover window to confirm purchase and add-to-cart events still report before dropping the old access path.
Billing: payment details do not become the new owner's automatically
Currency, time zone and billing country on an ad account usually cannot be changed after creation. Confirm all three fit the receiving side's finance and tax setup before taking over; if they do not, create a new account instead of forcing the handover. Payment methods belong to the payer, so the receiving side should add its own and remove the old one rather than keep charging someone else's card. Also check for unpaid balance, the account spending limit, how invoices and billing history will be retrieved, and whether the billing name matches the receiving legal entity. Handing over with an open balance invites disputes between the two parties.
When to stop and open a new account instead
Pause if any of these applies: unresolved restrictions, disables or appeals with unclear causes; currency or time zone that does not fit the receiving side; an ownership chain you cannot trace back to the original owner; or a counterpart who offers only login credentials rather than a BM-level transfer. One boundary matters here. Meta's terms do not allow ad accounts or personal profiles to be traded as goods, so this applies only to real working relationships such as agency changes, entity restructuring or project transfers. A account with a violation history carries that risk forward, and a clean new account with fresh data is often the cheaper path. Exact menus and limits depend on Meta's current help pages and Business settings.