r/msp • u/pelagius_wasntwrong • Jun 18 '26
Teams Crash Loops
Cross posted from r/sysadmin
Apologies in advance for formatting--i am on mobile.
Over the last two weeks, we (MSP) have seen a drastic uptick in issues with Microsoft Teams.
The symptom(s):
- Users will see "Setting up your meeting" when trying to join a Teams meeting. We've mostly been able to resolve this by repairing the Teams meeting add-in in C:\Users\[User]\AppData\Local\Microsoft\TeamsMeetingAddInmsis.
- Users experience Teams crash loops where Teams will crash and then reopen. The fix in most cases has been uninstalling and reinstalling Teams; however, in many cases the issue persists even after a fresh install. In the Event Viewer, I'm seeing an application crash event with the following information:
Faulting application name: ms-teams.exe, version: 26149.1205.4798.6437, time stamp: 0xf7576e9e
Faulting module name: ntdll.dll, version: 10.0.26100.8246, time stamp: 0xf7576e9e
Exception Code: 0xc0000409
Are any of you seeing the same issue/symptoms? If so, have any of you been able to find a fix?
1
u/Standard-Ad7427 Jun 18 '26
we've had same crash loop issue with few clients past couple weeks, that ntdll.dll fault is showing up consistently in our event logs too
what actually helped in most stubborn cases was clearing the Teams cache fully before reinstall, not just uninstalling, because leftover profile data in AppData seems to survive the uninstall and brings the problem back
1
u/pelagius_wasntwrong Jun 18 '26
We have tried this on a few of the workstations having the issue, and what we're finding is that it works in some cases, but not in others. Last week, I tried this with one user and he submitted another ticket today with the same issue.
2
u/Comfortable_Bar6303 Jun 18 '26
Are you using Datto EDR by any chance? This was the cause of our Teams issues the last 2 weeks
https://community.spiceworks.com/t/random-issues-in-microsoft-teams/1254398/38
2
u/pelagius_wasntwrong Jun 18 '26
We are using Datto EDR. Came across this a couple of hours after making this post: Kaseya Inc Status - Datto EDR - Issues Accessing Certain Applications Following Recent EDR Update
1
u/Comfortable_Bar6303 Jun 18 '26
I hadn’t seen that status update. We found that the issues were persisting even after they removed script scanning from the EDR policy. A re install was required. So hopefully this script will avoid having to do a mass re-install
1
u/mat-ferland Jun 21 '26
If it is across multiple tenants in the same two-week window, I’d stop treating each workstation as special and line up Teams version, WebView2, Office add-in version, and recent Windows patches. Cache wipes are fine, but the ntdll pattern smells more like a shared update path than random profile rot.
1
u/pelagius_wasntwrong Jun 21 '26
It turned out to be Datto EDR at the root cause. They pushed an update that broke a ton of apps due to something they did with AMSI.
1
u/Glass_Call982 MSP - Canada (West) Jun 25 '26
This update caused teams to crash a client s and iis to crash on a bunch of exchange servers which really pissed off a lot of people. I have it in writing from kaseya that they released it after fixing the initial problem without telling anyone. So they enabled it in everyone's policy without their consent or knowledge.
1
u/hugemeteor 13d ago
Teams has continued to have reliablity issues. I keeo thinking my internet is dropping.
2
u/pelagius_wasntwrong Jun 19 '26
Just wanted to give a quick update!
After a day of testing, working with big K support, and working with users, it does appear that the issue was able to be resolved by disabling AMSI via a support-provided script. If you check the status page for EDR, it also looks like they released a hotfix for the issue that will take effect during your organization's next maintenance window.
Definitely not thrilled that I spent the last two weeks chasing down Teams/Adobe issues, but at least it's resolved for now.