Can't connect to Meta platforms

So, I have multiple Instagram and Facebook pages. All of them have been set up as business pages, check all the marks that would allow for connecting to Express.

However, the following things happen:

• Facebook - either doesn't let me choose the page, or let me choose among one page and the FB groups I'm a part of;
• Instagram - I managed to connect it last year with one profile, with frequent demands to renew the token. Up until this January, where renewing kept giving error. I deleted the connection, and redoing it still gave error. If I do it know, it gives a bad gateway.

Drives me nuts, since the new addition today for multiple accounts and pages. And I can't find a solution, tried to totally disconnect my Meta account from Adobe and then reconnect it from scratch but no luck. And I can't find anything about it. 

EDIT: of course, as soon as I posted this, I figured it out: I opened the phone Facebook app, tapped settings, tapped on Business Integrations, deleted the integration with Adobe Express, and then reconnected everything in Adobe Express on PC.