This is not yet possible via the Graph API afaik, use the good old Set-CsTenantFederationConfiguration cmdlet.
How to add domain name to External access in Teams using Graph APi
I want to add domain name to External access lets your Teams and Skype for Business users communicate with other users that are outside of your organization using Graph APi
Microsoft Teams Microsoft Teams for business Other
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Vasil Michev 119.5K Reputation points MVP Volunteer Moderator
2020-08-20T12:58:53.573+00:00
2 additional answers
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JimmyYang-MSFT 58,641 Reputation points Microsoft External Staff
2020-08-21T06:30:46.703+00:00 Hi!
As a supplement, you can determine if users can communicate with people from other domains and if so, which domains they are allowed to communicate with. For more details, you can learn from:
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Manuel Hernandez 6 Reputation points
2022-01-20T15:23:55.993+00:00 Hello:
I've seen that with API Graph you can now add external domains
However, it seems that you still need to be Global Administrator. Is that correct or it only applies if you using delegated permission?. My intention is to add it as an application in Azure AD so it would be Application Permission.
Regards