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Hi Lisa,
This parameter RequireAcceptingAccountMatchInvitedAccount should be used with Set-SPOTenant cmdlet. You can use the command provided by Vasil.
If it is still not recognized, please install the latest SharePoint Online Management Shell and check the outcome.
For your convenience:
https://www.microsoft.com/en-gb/download/details.aspx?id=35588
Regards,
Ryan