Close your return. Go to MyCRA account, here https://bit.ly/2rAgym8 log in and then log out. Close the CRA page. Come back to your return, reopen it and try again.
Also, you may want to clear your browser cache as this may be preventing the software from connecting to the CRA account. Trying a different browser is also another option.
If the above steps do not resolve your issue, then I will advise you to contact our support team with instructions below. Answer the questions, so it guides you towards the right team. Apply the drop downs and you will get a phone number specified to your question (ie - support, care):
