External communication with teams (chat / invitation in teams etc.)

Question

Hello, everyone,

I have 2 different O365 tenants with the same problem. I have admin access to both tenants and can manage them.

Both tenants have guest access and external access to a. "Allow all external domains" is selected for external access.
I also checked the settings via Powershell. The settings are identical.

Identity : Global
AllowedDomains : AllowAllKnownDomains
BlockedDomains : {}
AllowFederatedUsers : True
AllowPublicUsers : True
AllowTeamsConsumer : True
AllowTeamsConsumerInbound : True
TreatDiscoveredPartnersAsUnverified : False
SharedSipAddressSpace : False

get-csexternalaccesspolicy

Identity : Global
Description :
EnableFederationAccess : True
EnableXmppAccess : False
EnablePublicCloudAccess : True
EnablePublicCloudAudioVideoAccess : True
EnableOutsideAccess : True
EnableAcsFederationAccess : True
EnableTeamsConsumerAccess : True
EnableTeamsConsumerInbound : True

Identity : Tag:FederationAndPICDefault
Description :
EnableFederationAccess : True
EnableXmppAccess : False
EnablePublicCloudAccess : True
EnablePublicCloudAudioVideoAccess : True
EnableOutsideAccess : True
EnableAcsFederationAccess : True
EnableTeamsConsumerAccess : True
EnableTeamsConsumerInbound : True

Identity : Tag:FederationOnly
Description :
EnableFederationAccess : True
EnableXmppAccess : False
EnablePublicCloudAccess : False
EnablePublicCloudAudioVideoAccess : False
EnableOutsideAccess : True
EnableAcsFederationAccess : True
EnableTeamsConsumerAccess : True
EnableTeamsConsumerInbound : True

Identity : Tag:NoFederationAndPIC
Description :
EnableFederationAccess : False
EnableXmppAccess : False
EnablePublicCloudAccess : False
EnablePublicCloudAudioVideoAccess : False
EnableOutsideAccess : True
EnableAcsFederationAccess : True
EnableTeamsConsumerAccess : True
EnableTeamsConsumerInbound : True

If I now want to open a chat or create a contact, I enter the email address / user name of the other tenant user.
Even when I search externally, there are no hits.

Does anyone have any idea what the problem is.

Answer 1

Hi @Stefan Wachsmuth ,

Yes the results are good.

For external accessing, please make sure:

For both/all tenants you want to contact with, choose the Allow all external domains or add all of them to the allow list. If you recently chaned it, it may take a few hours to days ( maybe one or two days) to take effect.

And if you want to search the external users, please enter their full address like abc@keyman .onmicrosoft.com

Best regards,
Lou

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