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Your Meeting Was Declined in Outlook/Exchange 2013. This resource does not accept meetings longer than 1440 minutes.

Resource rooms are set by default to 1440 minutes/24 hours/1 day.

To change, there is a different table than the one for get-mailbox, you have to use Get-CalendarProcessing | Set-CalendarProcessing.

To get the current settings:

Get-CalendarProcessing foo.resource |fl

You will see:

MaximumDurationInMinutes: 1440

To set for longer:

Set-CalendarProcessing foo.resource -MaximumDurationInMinutes 4320


NOTES:

https://docs.microsoft.com/en-us/powershell/module/exchange/mailboxes/Set-CalendarProcessing?redirectedfrom=MSDN&view=exchange-ps