Exchange Online NDR When the reoccurring outlook meeting is updated and sent

aanandkarki 

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aanandkarki wrote:

moerderin 

 

Nope I could not find the root cause but as a work around, I have removed the groups from the Meeting requests and cleared the cache and then resolved the name directly from GAL and sent the updated/modified request which fixed the issue.

 

I think it has something to do with DL membership caching.

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Too bad seemingly the only sure-fire solution on Google for this "Cannot modify recipients" error is complete Greek to me. Could some kind soul transcribe aanandkarki's comment into a step-by-step? Based on the email headers in my case, it seems the only recipients are 2 individuals; no "group" involved?

...To: Bob LastName <email@domain.com>, Sally LastName <email@domain.com>Subject: Bob LastName - Meeting Thread-Topic: Bob LastName - Meeting Thread-Index: [alphanumeric string]/[alphanumeric string]-MS-Exchange-Calendar-Originator-Id: [alphanumeric string];/o=ExchangeLabs/ou=Exchange Administrative Group ([alphanumeric string])/cn=Recipients/...

Edit: Oh...well, actually, manuphilip might have helped me--the user's account had Clutter enabled. I just disabled it via Exchange Online Powershell. We will see