Blank screen after "Send for Signature > Get started"

Hi,

We've been using Sign fine up until 16th May when after pressing "get started", the following page that loads is blank and does not allow any progress.

Sign is configured via integrated Apps on our 365 Tennant and the status shows as OK.

We are EU based (UK), and the status posted here states it is only Americas affected

https://status.adobe.com/products/503494