Just in case anyone else comes across tis issue I thought I'd record my workaround here. It'll also come in handy if I have to reinstall SnapCenter and encounter the same problem!
After installing SnapCenter I was unable to login via the browser. Attempting to do so resulted in the less than useful error message:
Due to security reason, the browser session has expired. Please close or refresh the browser and try again.
I have tried a variety of browsers and all produced the same error. However I was able to login using PowerShell, make our Domain Admins group SnapCenter admins then login as using an account in the domain admins group. The powershell code you need is: