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I cannot chat with my Skype for business basic account with externals
I have Skype for Business Basic at work and also a home Skype account. With my SFBB I cannot start a chat session or communicate with externals. And also in the other direction externals cannot sta...
You also have to have DNS records for Skype for Business to be able to talk to external users. You can find such records in Office 365 admin center under Domains menu and pressing on your main domain. There will be an option to export records as csv. You will have to add these records to DNS of your main domain.
Do you see presenceon these external users?
If not, federation is not activated for your user or environment.