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I created recurrent meeting with attendee in Office365 calendar.

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Then updated one of occurrence - change subject for creating modifications.

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I found Id of master event by graph-explorer and want to update subject. For updating I used GraphAPI batch: enter image description here

and as response I got error with code ErrorInternalServerError.

I use batch API because I need to update few events for one time.

After some manipulation I found that if for header Prefer add value as 'outlook.body-content-type='html'' instead 'outlook.body-content-type='text'' or remove it then batch API works correct: enter image description here

I need to use value of Prefer as 'outlook.body-content-type='text'' because business requirements for text only.

Do you have any idea how to use batch API for my case and with my options?

UPD: I tried to use update API without batching but also got the same error as for batch API update. In header I used Prefer as 'outlook.body-content-type='text'' enter image description here

So looks like any update of recurrent event with modifications and header Prefer as 'outlook.body-content-type='text'' finished as InternalServerError

Sergiy Bondar
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