Why can't I add interactive webinar user in the sandbox?

[Jiwon]

Hi there, I'm jiwon

I tried to add an interactive webinar user in the sandbox, but it failed.
When I add a user, the screen stops loaded. When I refresh the screen, it returns to the same screen as before I added a user.
(I attached a screen capture, please refer to it.)

Is it impossible to add an interactive webinar user in the sandbox?

I look forward to hearing from you soon.
Thank you.

[Michael_Florin]

Is it impossible to add an interactive webinar user in the sandbox?

---

No. We have Interactive Webinar in a sandbox and I can add users to it.

[uditmathur]

Hi @Jiwon ,

Log a support case with Marketo support.