If the purpose of the mailbox is to function as a queue rather than for individual use, it's recommended to use a shared mailbox in Exchange. Shared mailboxes don't require an Exchange Online license. To check if a mailbox is shared, open the Exchange admin center, select Recipients, and then select Shared. If the mailbox appears in this list, it's a shared mailbox. If it's a regular mailbox, you'll see an option to convert it to a shared mailbox.
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If you select Details in the alert, you see details similar to the following:
ActivityId: <GUID>
>Error : <ResponseMessageType xmlns:q1="https://schemas.microsoft.com/exchange/services/2006/messages" p2:type="q1:FindItemResponseMessageType" ResponseClass="Error" xmlns:p2="https://www.w3.org/2001/XMLSchema-instance"><q1:MessageText>An internal server error occurred. The operation failed., Mailbox '<Mailbox ID>' doesn't have a valid license.</q1:MessageText><q1:ResponseCode>ErrorInternalServerError</q1:ResponseCode><q1:DescriptiveLinkKey>0</q1:DescriptiveLinkKey><q1:MessageXml><t:Value Name="InnerErrorMessageText" xmlns:t="https://schemas.microsoft.com/exchange/services/2006/types">The license is invalid for this mailbox.</t:Value><t:Value Name="InnerErrorResponseCode" xmlns:t="https://schemas.microsoft.com/exchange/services/2006/types">ErrorInvalidLicense</t:Value><t:Value Name="InnerErrorDescriptiveLinkKey" xmlns:t="https://schemas.microsoft.com/exchange/services/2006/types">0</t:Value></q1:MessageXml></ResponseMessageType>
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