Team call handling - option to redirect calls if there is no answer

Dear Community

To prevent calls from being dropped when the Teams client is offline, we have set the global calling policy 'Voicemail for inbound calls' to 'On' (AllowVoicemail: AlwaysEnabled in PowerShell CsTeamsCallingPolicy). With this setting enabled, incoming calls to users who are not logged in to a client are forwarded to their voicemail.

TAC - Calling policies

Until recently (1-2 month?) users had the option to set the rule "When you can't answer a call" and "Ring for this many seconds before redirecting" in the Teams client.

Teams client - settings - calls

Now, only the 'Ring for this many seconds before redirecting' option is shown, and sometimes even that setting is unavailable. We cannot rule out an issue with the Teams client; however, resetting the app does not help at the moment.

Teams client - settings - calls

Reversing the entry on the calling policy 'Voicemail for inbound calls' to 'Let users decide' does solve the issue in the Teams client. However, depending on the user's configuration, calls may be dropped if the user is offline.

According to Microsoft's documentation, this is an expected behaviour; however, the user should not be able to change the redirection time (fixed to thirty seconds).  https://learn.microsoft.com/en-us/powershell/module/microsoftteams/set-csteamscallingpolicy

-AllowVoicemail

Enables inbound calls to be routed to voicemail.

Valid options are:

• AlwaysEnabled: Calls are always forwarded to voicemail on unanswered after ringing for thirty seconds, regardless of the unanswered call forward setting for the user.
• AlwaysDisabled: Calls are never routed to voicemail, regardless of the call forward or unanswered settings for the user. Voicemail isn't available as a call forwarding or unanswered setting in Teams.
• UserOverride: Calls are forwarded to voicemail based on the call forwarding and/or unanswered settings for the user.

What is the recommended policy setting for 'Voicemail for inbound calls' and how can we ensure that incoming calls are transferred to voicemail when the user is offline, while still enabling them to set 'When you can't answer a call'?

Many thanks.