I have the same problem wir AR 202.3. I could not find the "link this user ID to you my.myob account" anywhere.
Not in the company file User set-up menu nor in my my.myob account settings.
I've checked the Tax Office age in my MyGov account - my un-filled September Quater BAS form is sitting there, awaiting a download,
I've previously successfully lodged my BAS online in 2019-20
Can someone help me ?
Kym Yeoward in outer Darwin (Palmerston)
P.S. I held a BAS Agent registration number until late February.
Unfortunately it expired whilst I was in hospital - so I'll shortly re-apply
(not having done BAS Agent. in the meantime).