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Invite Attendees wont accept email address with o'apostrophe

When inviting attendees to new event, Outlook Calendar now won't accept email address with apostrophe eg in format "john.o'smith@agency.gov.xx" (generates error box "One or more attendees have invalid email addresses"), even though same email address is used to send emails and even forward received calendar events. This is a new development. Outlook used to let me invite to this (same) address - now just get error - is there any setting in Outlook Calendar to fix this incorrect error/block ??

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Byrne shared this idea  ·   ·  Flag idea as inappropriate…  ·  Admin →

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Outlook.com: Calendar

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