I am having the same problem. I did enter that I am the self-preparer and still get the critical diagnostic.
@ghunter999-gmail That's because I misread the question, thinking the OP was asking about marking the return as self-prepared.
Instead you should do the following:
You have clicked a link to a site outside of the ProConnect Community. By clicking "Continue", you will leave the Community and be taken to that site instead.