About automatic creation of ZOOM meeting room

question

I have
Various school teachers with their own ZOOM accounts,
I’m trying to create a system that automatically creates and pastes a ZOOM meeting URL when sending emails to students from the system.

The outline of the system is constructed according to the following flow.
①Obtain a token
https://zoom.us/oauth/token

②Obtain user information from the token obtained in ①
https://api.zoom.us/v2/users

(3) Create a conference room based on the user ID obtained in (2)
https://api.zoom.us/v2/users/[user_id]/meetings

④ Paste the meeting room URL created in ③ into the email

The question is, in my deleveper account,
I was able to create a conference room normally with the above flow,
When I conducted a test review with the person in charge of ZOOM, it was reported that an error occurred in ③.

I didn’t keep an error log, so
I’ll modify it to keep
I don’t know if there is something wrong with this flow in the first place.
Is there any problem with this flow in making this system?

*Sorry, I am not familiar with English, so I am translating automatically.
The text may be incorrect.

Hi @horinouchi
Thanks for reaching out to the Zoom Developer Forum!
I am happy to help here!
Have you been able to troubleshoot this issue on your end?
Let me know if you need some guidance

Cheers,
Elisa

Hi,Elisa

Any help would be appreciated