We have three users.
Two users, User A and User B, were invited by an external user, User C to an external channel and joined just fine.
User A invited me and I joined just fine to this external channel.
Now, User D, who has been with our company for a long time, receives the following message:
I have researched into this issue for two days now. I have no answer.As a workaround I have invited User D into this channel, which worked.
I cannot find the proper permission in the Permissions settings. Does anyone know what's going on?