I'm running into the same issue. @Benjamin-tc could you confirm the steps I took?
1. In Xcode, for my app and my app clip I added the associated domains for appclip:soosee.app
2. My AASA file looks like this:
	"appclips": {
		"apps": ["TEAMIDFROMCORRECTPAGE.com.goodsnooze.allergy.Clip"]
	}
}
No matter how I type in my url I still get the same error..
This URL is not contained in your app’s associated domains. Update associated domains or use a different URL.
@rynning, any clue?
jordi
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Oops, I wanted to choose the other answer as 'the answer'. Can't undo it now, sorry!
Thanks to both of you for the suggestions! Got a first version up and running!
The fast pass can now recognize: ["en-US", "fr-FR", "it-IT", "de-DE", "es-ES", "pt-BR"]
The accurate pass adds Chinese to that ["en-US", "fr-FR", "it-IT", "de-DE", "es-ES", "pt-BR", "zh-Hans", "zh-Hant"]
In iOS 14, the language support has been improved.
The .fast pass can now recognize: ["en-US", "fr-FR", "it-IT", "de-DE", "es-ES", "pt-BR"]
The accurate pass can also read chinese. ["en-US", "fr-FR", "it-IT", "de-DE", "es-ES", "pt-BR", "zh-Hans", "zh-Hant"]