Thanks for confirming that. Since you’re using the Clipchamp share link with “anyone can view” enabled, and it previously worked without sign-in, this change likely comes from a recent update on Clipchamp’s sharing or interactivity permissions.
Microsoft’s current guidance indicates that interactive elements now require viewers to be signed in with a Microsoft account to load properly. To verify, try opening the same link while signed in and see if the form appears. If it does, this confirms a policy or service update on Microsoft’s side. The best next step is to report this behavior through Clipchamp’s Help → Give Feedback option so Microsoft Support can review and confirm whether public interactive playback is still supported.