This exact question comes up in agency forums at scale: a team grows from a dozen clients to nearly a hundred, and suddenly the bottleneck is not content, it is connecting everyone's accounts without a spreadsheet of passwords or a Zoom call per client. The answer is a connection link. You set up a workspace per client, generate that workspace's link, choose which platforms it offers, and send it by email or text.
The client taps the link on their phone, picks their platforms, and signs in on each platform's own login screen. The authorization lands in your workspace ready to publish against. They never join your team, never see your other clients, never share a username or password, and never need to know what a Meta Business Portfolio is. The link covers Instagram, Facebook Pages, LinkedIn, TikTok, YouTube, X, Threads, and Pinterest; Google Business Profile is not on the client link yet. Every step is logged, from the first view to each account connected, you can watch which clients have done their part, and you can regenerate or revoke a link at any time.