Currently I've been a group owner and have full control permission and I want to add a user to my group, but when I try to add it, I'm facing some issues that I don't have access and I cannot navigate to the site permissions even though the menu is there.
Is there any recommendation to solve this issue and speculation for the root cause?
I would be happy if I could discuss it.
Who can edit the membership of the group?
which indicates who can add users in the group. Let me know if this works for you.