Getting this as well and it was working just fine moments ago, refreshed and not receiving this error as well. Maybe an outage? 

I have the same issue!

Typeform Support has posted the following on the status.typeform.com site: 

Oct 28, 2024

Typeform Renderer - Forms intermittently unavailable

Resolved - We are glad to inform you that the fix has been implemented and the incident resolved. We will run a problem investigation to understand what happened and how to prevent it from happening again.

Thanks for your understanding & sorry for any inconvenience this has caused.
Oct 28, 13:39 CET

Update - We are working on resolving the traffic interruption impacting the loading of some typeforms with high priority.

We are really sorry for any inconvenience this is causing. Next update in ~30 minutes or as soon as it's available.
Oct 28, 13:01 CET

Identified - We have identified a brief traffic interruption that affects the loading of typeforms. Some users may intermittently encounter a "no healthy upstream" error while attempting to load their forms. We are working on a resolution with high priority.

Next update in ~30 minutes or as soon as it's available.

REF: ZD 808202 | INC-68