Every Meta ad runs as a Facebook Page — the Page’s name and avatar are what people see above your ad. Bidder needs at least one Page it’s allowed to use.
The Page must be reachable from the portfolio that owns your ad account:
1
Add the Page to the portfolio
In Business Settings → Accounts → Pages → Add → Add a Page you own. (Requires full control of the portfolio, and the Page must not belong to another portfolio.)
Business Settings → Accounts → Pages — the Add dropdown.
2
Grant access to people
Under Users → People, select the person who will connect Bidder and assign the Page with full control or task-based access. Meta’s new Page model has no “admin/editor roles” — it’s full control vs. partial access.
When you click Continue with Facebook in the app, Meta’s dialog asks which Pages to share — tick this Page, or Bidder won’t be able to run ads as it.
During setup Bidder also asks about Instagram: if you connect a real Instagram account your ads use your handle; if not, Meta shows a Page-backed stand-in derived from this Page — functional, just less brand presence.