Not authorized to send documents for signature.

Hello,

I am having an issue where I log in to Adobe Sign and the "Get a signature" box with the "Get a document signed" option within it has disappeared. I therefore cannot send any documents out for signature anymore and where I have tried to access this through the option in Document Cloud, I get the message "You are not authorized to sent documents for signature. Please contact your account administrator.". It should not be down to a payment problem either.

Is there any way to fix this?

Thank you.