The user needs to sign in to active Office 365 or you can use the Azure Single Sign-On. In the left pane of the Accounts box, select the account.
If you verify that your account settings are correct, but you still cant send messages, try turning on SMTP authentication. Some email services require authentication for their SMTP server. Setting the autoactivate to 1 isn’t necessary for Office 365. Solution: Turn on SMTP authentication for the POP or IMAP account. Does 'Server Error: 421 Too many messages' represent. In each case, however, there are few more words in the actual errors reported after the 'too many messages' message that you're getting. You can read more about targeted release for Office 365 here at Microsoft. Entering the search phrase 'Server Error: 421 Too many messages' returns all kinds of results identifying multiple 421 reasons.
Note: Valid token but insufficient permission for the action. I use the targeted release for this and have assigned a couple of key users to be updated first. Note: Usually caused by an invalid or expired authorization header. is supported on client version and above. OS Platform is not supported for this action. Variable content is indicated in the table by angle brackets. The content of actual messages will vary based on the factors that triggered the response.
The error message column in the table section provides some sample messages. Every error response will contain an error message, which can help resolve the problem. Microsoft makes no warranties, express or implied, with respect to the information provided here.Įrror codes may be returned by an operation on any of the Microsoft 365 Defender APIs. Some information relates to prereleased product which may be substantially modified before it's commercially released.
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