teams presence not updating - users are on prem exchange 13/19

Question

We are currently running all our mailboxes and client access on exchange server 2013.
We have AD connect running and syncing to azure with no issue.
We ran the hybrid configuraiton wizard for exchange 2019 on a new hybrid server and it is configured. mailflow is flowing back and forth with no issue.

We have stood up 2 x2019 mailbox/cas servers and migrated 2 test users to 2019.

We also have a lync server 2013 on premise that we were using for IM, mainly between IT departments no other real use. (not sure if this is the culprit)

We have licensed those on premise mailboxes(a few 2013 and the 2x 2019) with e3 365 licenses in order to give them access to teams. Their mailbox still lives on premise and will not be moving to 365 anytime soon.

I am having the following issue.
When an onpremise user(whether the users mailbox sits on exchange 2013 or exchange 2019) is in a meeting that is scheduled and showing up on their calendar. On teams, it still shows their presence as available.
*****Using a test 365 account i can schedule a meeting with an onprem user and see their free busy with no issue, but it does not change their presence even when viewiing the user with a 365 full blown online account.

note that the on prem2013 lync server is still on but no longer being used, and we never did a "migration" to teams from 365 as this was not really needed to keep things in parallel.

Appreciate any assistance that can be provided.

Answer 1

Hi!

Do you mean the Lync Server and Teams are completely independent?

Does this issue persist all the time?

To my knowledge, if you can see the calendar in Teams normally, we can make sure there is no issue in hybrid deployment in Exchange 2019. In this case, we recommend you check if your Teams coexistence mode is Teams only.
https://techcommunity.microsoft.com/t5/microsoft-teams-blog/update-presence-now-respects-a-user-s-coexistence-mode/ba-p/280190

Besides, you can try to follow this link to check your registry:
https://community.spiceworks.com/topic/2205614-microsoft-teams-issue-syncing-status-to-outlook#:~:text=Lync%20to%20Teams-,close%20registry%20and%20restart%20outlook%20and%20MS,Enjoy!!&text=Teams%20%2D%2D%3E%20Settings%20%2D%2D%3E%20General,select%2Frecheck%20the%20same%20box.

Answer 2

@JimmyYang-MSFT I do believe they are independant as I never configured anything with lync server 2013 for external or federation access. Lync was always only used internally, but it did update the status with our calendar meetings.

This issue happens all the the time, except for when a user is fully on 365. if their mailbox is on 365, in teams i see their presence change when they are in a meeting and i see this while signed in to a teams account that is on premise(2013 or 2019).

To use teams, all i did was license adconnect syncd users with 365 e3. they now sign on to teams with their upn@mathieu.company .com and their AD password. I didnt make any changes as far as coexistence mode or anything like that, whatever is default is whats running now on all my users which i think is islands mode? not sure.

fyi, most of the users im enabling for teams with the license, some of them also do have lync enabled users on premise as well. not sure if this is an issue?

I am using my account as a test account and i did do that registry entry you linked to, and checked off the checkbox in teams but it does not work. would it matter if my mailbox is sitting on a 2013 mailbox server? i also have a test account thats sittign on 2019 that i cannot get presence to update.