Error adding external user ID to Distribution group in Office 365

By shoaib1632307233 ·
Tags: Cloud
I am facing an issue with exchange 365, kindly if someone help me out here.

I am not able to add external email address to the mailing list for example.,
I tried adding a contact to my contact list first then tried to add from the distribution list but it gives me an error like this one, I am authorized to use and edit the distribution list.
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