Not authorized to send documents for signature

I recently took out a free trial for Adobe Reader and did not renew at the end of the trial.

Since then, I have received the message that I am not authorised to send documents for signature., even though I am supposed to be able to send 2 documents per month for free as part of the Acrobat application.

The error occurs in both the desktop version and the web version of Acrobat. This is just a singular account. There is no account administrator.