Temporary issue with OAuth login?

I have just noticed that OAuth login is failing after clicking the Approve App button, instead of redirecting to the app i am getting an error page shown from the main freeagent website:
“Sorry, you’re not allowed to see that page”

The url shown is:
which should have redirected.

It was working fine at 11:48 today, now it’s not working.
The sandbox api is also not working which worked earlier.

Chris, sorry about that. We’re looking into it now.

Hi Chris,

This issue was caused by a change that went out earlier this afternoon; it shouldn’t have affected existing users and I apologise for any frustration it caused.

We’ve just deployed a fix and can confirm that app approvals are now working again.