I've invited some guests into my domain. They are added successfully, but when they confirm the invitation, the user gets a 503 gateway error from invitations.microsoft.com
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1intermittent errors. Refresh the page with invitations..., should be OK. – astaykov Jun 28 '18 at 20:31
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1Thank you @astaykov was this a temporary problem yesterday? – Justin Dearing Jun 29 '18 at 12:45
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I have seen similar intermittent failures couple of times already. Simple refresh - either immediately or after couple of seconds/minutes should resolve the issue.
If the issue persist for longer then couple minutes you should open a support ticket.

astaykov
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