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Shared Mailbox can have a password and login enabled without license
I'm very much aware of the license requirements for Shared Mailboxes in Exchange Online and for all Shared Mailboxes we always give licensed users access to them. If we need to login to the actual sh...
This "feature" has been around for years, but despite probing Microsoft numerous times about it, we haven't received a clear answer. Until we do so, assume that it's unsupported, and that it breaks the license agreement.
Applications should still be able to access the mailbox via delegate/impersonation permissions.
This article https://docs.microsoft.com/en-us/exchange/recipients/user-mailboxes/convert-mailboxes?view=exchserver-2019 stated that
For room mailboxes, you can enable the associated user account, which also requires you to specify a password (which requires the Reset Password role). You need to enable the room mailbox user account for features like the Skype for Business Room System.
