Guest user limitation in Business Central
Guest users in Microsoft Dynamics 365 Business Central face certain limitations due to their external domain status. One significant challenge arises with email functionality. For instance, when utilizing the new Mail capability extension and selecting the "Current user" option, guest users encounter issues because their email address format does not align with the standard internal domain format; it typically appears as `guestuser_guestdomain.com#EXT#@mydomain.com`.
Attempts to send emails, such as quotes or invoices, result in an error stating "Resource could not be discovered." This limitation can pose problems, especially for users responsible for bulk emailing tasks like monthly invoice distribution.
Workarounds, such as using an email client for sending individual documents or configuring SMTP with PowerShell to enable sending through a tenant's SMTP server, can provide partial solutions. However, these methods may lack efficiency and do not equate to the seamless experience enjoyed by internal users. This limitation underscores the need for organizations to carefully consider the scope of access and capabilities assigned to guest users in Business Central.
