ACCOUNTANT USER SET TO READ ONLY AND ADMINISTRATOR CANNOT CHANGE

I am an accoutant and a new client has invited me to access their online file.  I have accepted this invite and then logged into Accountright on my computer and accessed their online file.  I go straight into the file through my email with no other extra codes to use.  I can read everything but cannot write, that is make changes as required.  I have confirmed with my client and can see when I am in the file that my user is setup as accountant and administrator.  My user roles are all ticked and the button read and write are also highlighted.  the one difference though is that at the top of my user access the read only button is highlighted next to the my user inactive.  I believe this read only button is the reason I cannot write even though all read and write buttons are highlighted.  The client who is the original administrator cannot untick the read only button as it is greyed out.  We have removed my authority to access and reinvited me with nowhere asking for this role to be chanaged.  My client has spent an hour on the phone with MYOB and they have not helped.  I am asking if there is some silly reason that this happens for e.g. there can only be 3 administrators and I am the fourth so read only access is granted.  Never thad this issue before.  Thanks in advance Liz