Hi there,
posting the result of this thread in case it’s useful for others .
It did appear to be a bug on Asana’s end and support ended up solving it for us. Below is the support response. Thanks for responding above @Andrea_Mayer
To provide some context, we do have a 100 invite restriction on guest users within free Asana organizations to prevent potential phishing attacks, which we reset the limit on our end. This should, however, only apply to guest users so I was a bit confused as to why you would also have difficulties inviting members. I reset the limit regardless to check if this would unblock you.
Since this also affected members in your case, that seems to be a Bug with our invite restrictions and I will make sure to forward this to the responsible team to fix. For now, you should have not further restrictions on invites moving forward.