I want to give some permissions to the users from Atlassian Access and they should be in a default group called "All members for directory" but they are not. In the admin.atlassian.com i can see that the group exists but when i go to my site to the group section it isnt there.
Does someone knows why?
I think that group will be there based on it actually being synced, never had an experience where I had to add users directly into that group or refer to such group after adding users from my SSO admin hub. So back to your question, you should give any default group access (i.e. to any application) from your SSO admin hub which in turn are synced into that group. I don't think it's necessary to add the users to that group as its like an identifier to any Atlassian group you've provided from your SSO provider.