@fedilab@toot.fedilab.app btw, my problem is not relatet to friendica, but topic seams similar.
More details: I see in website of my mastodon acc fedilab lite as authorized app, after i copied inapp auth link into extern webbrowser. But the return link from browser just opens fedilab apps settings page and nothing happens. Back button just give me again the inapp page with that auth link, another "back" again the app startpage where the same loophole just start again.