Urgent issue with patching of calendar invites on outlook

Question

While trying to patch events using graph api endpoint:

https://graph.microsoft.com/v1.0/me/events/AAMkADcwNTg4ZTQyLTE5MjktNDY4MC1hYzBjLWFiOTJlYmYxYjAzMwBGAAAAAAAgC0p-T--jSLMFk2EcVLhUBwDWlhlCU8Q8QpVYxnV4luGRAAAAAAENAADWlhlCU8Q8QpVYxnV4luGRAADT60VEAAA=

with the following payload:

the response is not correctly reflecting on the calendar invite.

It does not appear as "accepted" when we use the GET /events endpoint after doing a PATCH and instead the response status is returned as "none". Outlook returns a 200 response code, but there is no change in the attendee response.

Have tried verifying using graph explorer that we can indeed pass "Accepted" as a response status and the event gets created successfully on Outlook calendar.

This behaviour started around 12th/13th February and is consistently occurring now.

If any more details are required, happy to provide them.